CH 6 SUM: Support Systems in Animals:
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Questions and Answers

What is the function of the vertebral column?

  • Forms the tailbone
  • Supports the upper limbs
  • Creates structural integrity (correct)
  • Facilitates bending and twisting of the torso

    • Which type of joint allows no movement?

  • Synovial joints
  • Cartilaginous joints
  • Fibrous joints (correct)
  • Antagonistic joints

    • What is the primary function of tendons?

  • Provide flexibility at joints
  • Create structural connectivity in the skeleton
  • Connect bones to muscles
  • Attach muscles to bones (correct)

    • What is the composition of bones primarily made of?

    <p>Mineral salts like calcium and phosphates</p> Signup and view all the answers

    Which part of the musculoskeletal system does not contain blood vessels or nerves?

    <p>Cartilage</p> Signup and view all the answers

    What is the purpose of antagonistic muscles in movement?

    <p>Control movement by contracting and relaxing</p> Signup and view all the answers

    Which type of joint permits slight movement?

    <p>Cartilaginous joints</p> Signup and view all the answers

    What happens to cartilage during growth?

    <p>It gets ossified into bone gradually</p> Signup and view all the answers

    What is the primary role of ligaments in the musculoskeletal system?

    <p>Providing stability to joints</p> Signup and view all the answers

    Which component covers the ends of bones at joints to reduce friction during movement?

    <p>Cartilage</p> Signup and view all the answers

    What is the primary function of bones in the context of locomotion?

    <p>Providing structural support and bearing weight</p> Signup and view all the answers

    Which type of muscle tissue is consciously controlled to perform various actions?

    <p>Skeletal muscle</p> Signup and view all the answers

    What connects bones and allows for their movement relative to each other in the musculoskeletal system?

    <p>Joints</p> Signup and view all the answers

    What are antagonistic muscles in the musculoskeletal system responsible for?

    <p>Moving bones at joints in opposition to each other</p> Signup and view all the answers

    Which tissue acts as a cushion between bones at joints to prevent damage and distribute loads evenly?

    <p>Cartilage</p> Signup and view all the answers

    What are myofibrils composed of within muscle fibers that are responsible for muscle contraction?

    <p>&quot;Sarcomeres&quot;</p> Signup and view all the answers

    What is the primary function of a skeleton in an organism?

    <p>Providing structure, support, and protection</p> Signup and view all the answers

    Which type of skeleton consists of a fluid-filled cavity surrounded by muscles?

    <p>Hydrostatic skeleton</p> Signup and view all the answers

    What advantage does a hydrostatic skeleton provide to organisms?

    <p>Adaptability to narrow spaces</p> Signup and view all the answers

    Which organisms commonly possess hydrostatic skeletons?

    <p>Jellyfish and earthworms</p> Signup and view all the answers

    What environmental condition is necessary for organisms with hydrostatic skeletons?

    <p>Aquatic environment</p> Signup and view all the answers

    Which disadvantage is associated with hydrostatic skeletons?

    <p>Lack of rigid support</p> Signup and view all the answers

    What type of skeleton is not mentioned in the text?

    <p>Cartilaginous skeleton</p> Signup and view all the answers

    Which advantage is NOT associated with hydrostatic skeletons?

    <p>Rigid support for heavy bodies</p> Signup and view all the answers

    Which type of skeleton requires moulting to accommodate growth?

    <p>Exoskeleton</p> Signup and view all the answers

    What is a disadvantage of endoskeletons?

    <p>They offer less protection from external threats</p> Signup and view all the answers

    Which bone category is primarily responsible for large movements?

    <p>Long bones</p> Signup and view all the answers

    What purpose does the pelvic girdle serve in the human body?

    <p>Supporting the lower limbs</p> Signup and view all the answers

    Which category of bones provides stability and support with slight movements?

    <p>Short bones</p> Signup and view all the answers

    What is the role of the axial skeleton in the human body?

    <p>It forms the central axis of the body</p> Signup and view all the answers

    Which of the following bones protects the brain and forms the structure of the face?

    <p>Skull</p> Signup and view all the answers

    Which of the following organisms typically possess an exoskeleton?

    <p>Insects</p> Signup and view all the answers

    What is the main function of the epimysium?

    <p>To bundle multiple fascicles together forming an entire muscle</p> Signup and view all the answers

    Which protein filaments slide over the other during muscle contraction?

    <p>Myosin filaments slide over actin filaments</p> Signup and view all the answers

    Which organelle in muscle fibers provides energy during muscle contraction?

    <p>Mitochondria</p> Signup and view all the answers

    What nutrient deficiency primarily causes rickets in children?

    <p>Vitamin D deficiency</p> Signup and view all the answers

    What imbalance in the bone remodeling process leads to osteoporosis?

    <p>Both excess bone resorption by osteoclasts and inadequate bone formation by osteoblasts</p> Signup and view all the answers

    What type of arthritis is caused by mechanical wear and tear on joints?

    <p>Osteoarthritis</p> Signup and view all the answers

    What autoimmune disorder causes the immune system to attack joint tissues?

    <p>Rheumatoid arthritis</p> Signup and view all the answers

    What is the main energy source for muscle contraction?

    <p>Adenosine triphosphate (ATP)</p> Signup and view all the answers

    What type of skeleton is made up of a hard outer shell?

    <p>Exoskeleton</p> Signup and view all the answers

    Which type of skeleton offers less protection from external threats compared to exoskeletons?

    <p>Endoskeleton</p> Signup and view all the answers

    Which type of bones primarily provides stability and support with slight movements in the human skeleton?

    <p>Short bones</p> Signup and view all the answers

    What category of bones features complex shapes that fulfill specific functions?

    <p>Irregular bones</p> Signup and view all the answers

    What structures does the axial skeleton comprise in the human body?

    <p>Skull, vertebral column, and thoracic cage</p> Signup and view all the answers

    Which structure supports the lower limbs and includes the ilium, ischium, and pubis?

    <p>Pelvic girdle</p> Signup and view all the answers

    Which category of bones primarily acts as levers for large movements in the human body?

    <p>Long bones</p> Signup and view all the answers

    What is the function of the vertebral column in the human body?

    <p>Houses the spinal cord and supports the body's weight</p> Signup and view all the answers

    What type of skeleton allows for movement by the contraction of muscles against the fluid pressure within a cavity?

    <p>Hydrostatic Skeleton</p> Signup and view all the answers

    Which type of skeleton is characterized by its flexibility and energy efficiency?

    <p>Hydrostatic Skeleton</p> Signup and view all the answers

    Which type of skeleton provides no solid support and limits the size and mobility of organisms on land?

    <p>Hydrostatic Skeleton</p> Signup and view all the answers

    Which type of skeleton is found in organisms such as jellyfish, earthworms, and starfish?

    <p>Hydrostatic Skeleton</p> Signup and view all the answers

    What type of skeleton allows organisms to recover from damage more quickly due to its simple structure and fluid nature?

    <p>Hydrostatic Skeleton</p> Signup and view all the answers

    Which type of skeleton must reside in moist or aquatic environments to prevent desiccation?

    <p>Hydrostatic Skeleton</p> Signup and view all the answers

    What type of skeleton consists of a fluid-filled cavity surrounded by muscles, allowing for movement by muscle contractions against fluid pressure?

    <p>Hydrostatic Skeleton</p> Signup and view all the answers

    Which type of skeleton is not associated with characteristics such as rigidity, protection, or weight-bearing capabilities?

    <p>Hydrostatic Skeleton</p> Signup and view all the answers

    What type of tissue connects muscles to bones?

    <p>Tendons</p> Signup and view all the answers

    What is the primary role of ligaments in the musculoskeletal system?

    <p>To provide stability to the joints</p> Signup and view all the answers

    What is the primary function of cartilage in the musculoskeletal system?

    <p>To reduce friction between bones and act as a cushion</p> Signup and view all the answers

    What is the main function of antagonistic muscles?

    <p>To work in opposition to each other to move bones at joints</p> Signup and view all the answers

    What type of joints allow for a wide range of movements, such as bending, twisting, and extending?

    <p>Synovial joints</p> Signup and view all the answers

    What is the primary function of bones in locomotion?

    <p>To provide the structural framework of the body</p> Signup and view all the answers

    What is the role of myofibrils within muscle fibers?

    <p>To be responsible for muscle contraction</p> Signup and view all the answers

    What type of cavity do synovial joints feature?

    <p>Fluid-filled cavity</p> Signup and view all the answers

    What is the function of the sarcoplasmic reticulum in muscle cells?

    <p>To store and release calcium ions</p> Signup and view all the answers

    How does a deficiency in vitamin D contribute to the development of rickets in children?

    <p>By preventing the absorption of calcium and phosphorus</p> Signup and view all the answers

    What is the primary cause of osteoporosis?

    <p>An imbalance in the bone remodeling process</p> Signup and view all the answers

    Which of the following is NOT a symptom of arthritis?

    <p>Increased mobility</p> Signup and view all the answers

    What is the primary role of mitochondria in muscle fibers?

    <p>To produce energy through cellular respiration</p> Signup and view all the answers

    Which of the following is NOT a cause of osteoporosis?

    <p>Increased protein intake</p> Signup and view all the answers

    What are the two primary types of protein filaments involved in muscle contraction?

    <p>Actin and myosin</p> Signup and view all the answers

    Which type of arthritis is an autoimmune disorder?

    <p>Rheumatoid arthritis</p> Signup and view all the answers

    Which bone category primarily provides stability and support with slight movements?

    <p>Thoracic Vertebrae</p> Signup and view all the answers

    What type of joint allows no movement?

    <p>Fibrous Joint</p> Signup and view all the answers

    Which organelle in muscle fibers provides energy during muscle contraction?

    <p>Mitochondria</p> Signup and view all the answers

    What happens to cartilage during growth?

    <p>It transforms into bone tissue</p> Signup and view all the answers

    Which organism typically possesses an exoskeleton?

    <p>Insect</p> Signup and view all the answers

    What is the primary function of ligaments in the musculoskeletal system?

    <p>Connect bones to other bones</p> Signup and view all the answers

    What nutrient deficiency primarily causes rickets in children?

    <p>Vitamin D</p> Signup and view all the answers

    What is the main function of the epimysium?

    <p>It provides muscle protection</p> Signup and view all the answers

    Which component of the musculoskeletal system plays a pivotal role in providing support and flexibility at joints?

    <p>Cartilage</p> Signup and view all the answers

    What distinguishes cartilage from other tissues in the body?

    <p>Presence of blood vessels</p> Signup and view all the answers

    Which type of joint allows free movement in various directions?

    <p>Synovial joints</p> Signup and view all the answers

    What is the primary role of tendons in the musculoskeletal system?

    <p>Facilitate muscle-bone force transfer</p> Signup and view all the answers

    Which function does the vertebral column primarily serve in the human body?

    <p>Encase and protect the spinal cord</p> Signup and view all the answers

    What advantage does an exoskeleton provide that is NOT mentioned in the text?

    <p>Prevents diseases and infections</p> Signup and view all the answers

    Which disadvantage is associated with endoskeletons that is NOT mentioned in the text?

    <p>Vulnerability to external threats</p> Signup and view all the answers

    What key function does the pelvic girdle serve in the human body?

    <p>Supports the lower limbs</p> Signup and view all the answers

    Which category of bones in the human skeleton provides protection for internal organs and a broad surface for muscle attachment?

    <p>Flat Bones</p> Signup and view all the answers

    What is a key difference between exoskeletons and endoskeletons regarding growth?

    <p>Exoskeletons enable continuous growth without moulting</p> Signup and view all the answers

    What is a primary function of the axial skeleton in the human body?

    <p>Protecting internal organs like the heart and lungs</p> Signup and view all the answers

    Which type of skeleton offers less protection from external threats compared to endoskeletons?

    <p>Exoskeleton</p> Signup and view all the answers

    What is the main function of tendons in the musculoskeletal system?

    <p>Attaching muscles to bones</p> Signup and view all the answers

    Why are ligaments essential in the musculoskeletal system?

    <p>To prevent excessive joint movements</p> Signup and view all the answers

    What is the primary role of antagonistic muscles in the human body?

    <p>Moving bones at joints in opposition to each other</p> Signup and view all the answers

    How do cartilage tissues facilitate movement in the musculoskeletal system?

    <p>By reducing friction between bones</p> Signup and view all the answers

    What is the hierarchical structure of skeletal muscle composed of myofibrils and muscle fibers called?

    <p>Fascicles</p> Signup and view all the answers

    What allows joints to bend, twist, and extend in various directions?

    <p>Synovial fluid</p> Signup and view all the answers

    How do bones contribute to locomotion in the musculoskeletal system?

    <p>By providing a rigid framework for the body</p> Signup and view all the answers

    What is the primary function of muscles in the human body?

    <p>To facilitate movement and support</p> Signup and view all the answers

    What is a key advantage of hydrostatic skeletons for organisms?

    <p>Flexibility and energy efficiency</p> Signup and view all the answers

    Which of the following is a disadvantage of hydrostatic skeletons?

    <p>Environmental limitations</p> Signup and view all the answers

    Why do hydrostatic skeletons require organisms to be in moist or aquatic environments?

    <p>To prevent desiccation</p> Signup and view all the answers

    Which feature is unique to hydrostatic skeletons compared to exoskeletons and endoskeletons?

    <p>Flexibility due to fluid dynamics</p> Signup and view all the answers

    In what type of environments do organisms with hydrostatic skeletons thrive?

    <p>Moist or aquatic environments</p> Signup and view all the answers

    Which advantage of hydrostatic skeletons contributes to their energy efficiency?

    <p>Fluid dynamics in movement</p> Signup and view all the answers

    What type of support do hydrostatic skeletons lack, unlike exoskeletons and endoskeletons?

    <p>Rigid structural support</p> Signup and view all the answers

    What is the primary role of the sarcoplasmic reticulum in muscle cells?

    <p>To store and release calcium ions for muscle contraction</p> Signup and view all the answers

    What is the primary cause of rickets in children?

    <p>Deficiency in vitamin D</p> Signup and view all the answers

    What is the primary function of actin filaments in muscle contraction?

    <p>To slide over myosin filaments during muscle contraction</p> Signup and view all the answers

    What is the primary cause of osteoporosis in older adults?

    <p>Decreased estrogen levels in postmenopausal women</p> Signup and view all the answers

    What is the primary cause of osteoarthritis?

    <p>Mechanical wear and tear on joints</p> Signup and view all the answers

    What is the primary function of the myosin filaments in muscle contraction?

    <p>To bind with actin filaments and undergo power strokes</p> Signup and view all the answers

    What is the primary cause of rheumatoid arthritis?

    <p>Autoimmune disorder</p> Signup and view all the answers

    What is the main energy source for muscle contraction?

    <p>Adenosine triphosphate (ATP)</p> Signup and view all the answers

    What is a key disadvantage of exoskeletons that is NOT mentioned in the text?

    <p>Limited flexibility for complex movements</p> Signup and view all the answers

    Which of the following is an advantage of endoskeletons over exoskeletons that is mentioned in the text?

    <p>Growth accommodation without moulting</p> Signup and view all the answers

    What characteristic differentiates flat bones from long bones in the human skeleton?

    <p>Protection of internal organs and muscle attachment surface</p> Signup and view all the answers

    Which bone category primarily provides protection for internal organs in the human skeleton?

    <p>Flat Bones</p> Signup and view all the answers

    What crucial function does the appendicular skeleton serve in the human body?

    <p>Movement and interaction with the environment</p> Signup and view all the answers

    Which aspect of endoskeletons makes them susceptible to diseases and infections, as stated in the text?

    <p>Being composed of living tissues</p> Signup and view all the answers

    What provides support for large movements as a primary function in the human body?

    <p>Long Bones</p> Signup and view all the answers

    Which primary function is served by the vertebral column in the human body?

    <p>Forming the central axis and protecting vital structures</p> Signup and view all the answers

    Which of the following organisms is most likely to possess a hydrostatic skeleton?

    <p>Starfish</p> Signup and view all the answers

    What is a significant disadvantage of hydrostatic skeletons compared to endoskeletons?

    <p>Lack of rigid support</p> Signup and view all the answers

    Which of the following advantages is NOT associated with hydrostatic skeletons?

    <p>Greater rigidity</p> Signup and view all the answers

    Which environmental factor is necessary for organisms with hydrostatic skeletons?

    <p>Aquatic or moist environments</p> Signup and view all the answers

    Which of the following best describes the function of antagonistic muscles?

    <p>Contracting against each other to enable movement</p> Signup and view all the answers

    Which type of joint allows no movement?

    <p>Sutures</p> Signup and view all the answers

    What is the main function of ligaments in the musculoskeletal system?

    <p>Connecting bones and providing stability to joints</p> Signup and view all the answers

    Which of the following organisms typically possesses an exoskeleton?

    <p>Lobster</p> Signup and view all the answers

    What type of vertebrae connect to the ribs in the human skeleton?

    <p>Thoracic vertebrae</p> Signup and view all the answers

    Which tissue does not contain blood vessels or nerves and provides support and flexibility at joints?

    <p>Cartilage</p> Signup and view all the answers

    Which pair of muscles work together as antagonistic muscles to control forearm movement?

    <p>Biceps and triceps</p> Signup and view all the answers

    What is the primary role of synovial joints in the musculoskeletal system?

    <p>Enable free movement in various directions</p> Signup and view all the answers

    Which part of the human skeleton supports the upper limbs and consists of the clavicle and scapula?

    <p>Pectoral girdle</p> Signup and view all the answers

    What is the main energy source for muscle contraction?

    <p>ATP</p> Signup and view all the answers

    Which type of skeleton allows for movement by the contraction of muscles against the fluid pressure within a cavity?

    <p>Hydrostatic skeleton</p> Signup and view all the answers

    What is the primary role of the axial skeleton in the human body?

    <p>Protect internal organs</p> Signup and view all the answers

    Which protein filament in muscle contraction contains the protein myosin?

    <p>Myosin Filaments</p> Signup and view all the answers

    Which organelle in muscle cells stores and releases calcium ions crucial for muscle contraction?

    <p>Sarcoplasmic Reticulum</p> Signup and view all the answers

    Which nutrient deficiency primarily causes rickets in children?

    <p>Vitamin D</p> Signup and view all the answers

    Which type of arthritis is an autoimmune disorder caused by the immune system attacking joint tissues?

    <p>Rheumatoid Arthritis</p> Signup and view all the answers

    What is the primary cause of osteoporosis in older adults?

    <p>Hormonal changes</p> Signup and view all the answers

    Which organelle in muscle fibers provides energy during muscle contraction?

    <p>Mitochondria</p> Signup and view all the answers

    What is the primary cause of rickets in children?

    <p>Insufficient sun exposure</p> Signup and view all the answers

    Which type of joint permits slight movement?

    <p>Cartilaginous joint</p> Signup and view all the answers

    What is the primary role of tendons in muscle contraction?

    <p>They act as the mechanical link between muscles and bones, converting muscle contractions into bone movement</p> Signup and view all the answers

    What are myofibrils composed of within muscle fibers?

    <p>Actin and myosin filaments</p> Signup and view all the answers

    What is the main function of antagonistic muscles in the musculoskeletal system?

    <p>They work in opposition to each other to move bones at joints</p> Signup and view all the answers

    What is the primary cause of rheumatoid arthritis?

    <p>An autoimmune disorder</p> Signup and view all the answers

    What is the main function of the pelvic girdle in the human body?

    <p>Providing attachment sites for muscles</p> Signup and view all the answers

    What allows joints to bend, twist, and extend in various directions?

    <p>The presence of synovial fluid in joint cavities</p> Signup and view all the answers

    Which organelle in muscle fibers provides energy during muscle contraction?

    <p>Mitochondria</p> Signup and view all the answers

    What is the primary function of bones in locomotion?

    <p>Providing stability and support, and facilitating movement</p> Signup and view all the answers

    What disadvantage of exoskeletons is NOT mentioned in the text?

    <p>Vulnerability to external threats</p> Signup and view all the answers

    Which advantage of endoskeletons indirectly relates to their ability to support larger body sizes?

    <p>Flexibility and Mobility</p> Signup and view all the answers

    In what way do flat bones differ from irregular bones in terms of function?

    <p>Primarily provide protection for internal organs</p> Signup and view all the answers

    Which category of bones in the human skeleton plays a key role in acting as levers for large movements?

    <p>Long Bones</p> Signup and view all the answers

    What is a major function of the axial skeleton that is not explicitly mentioned in the overview?

    <p>Produces red blood cells</p> Signup and view all the answers

    Which bone included in the human skeleton serves the function of supporting the lower limbs?

    <p>Pelvic Girdle</p> Signup and view all the answers

    What feature distinguishes endoskeletons from exoskeletons in terms of growth accommodation?

    <p>Continuous growth without moulting</p> Signup and view all the answers

    What unique function do hydrostatic skeletons enable organisms to perform, as described in the text?

    <p>Adapting their shape to environmental conditions</p> Signup and view all the answers

    Which advantage of hydrostatic skeletons is NOT mentioned in the text?

    <p>Increased Speed</p> Signup and view all the answers

    Which type of environment must organisms with hydrostatic skeletons primarily reside in to prevent desiccation?

    <p>Moist or Aquatic Environments</p> Signup and view all the answers

    What is a significant disadvantage of hydrostatic skeletons compared to endoskeletons and exoskeletons mentioned in the text?

    <p>Lack of rigid support</p> Signup and view all the answers

    Which type of skeleton offers faster recovery from damage due to its simple structure and fluid nature?

    <p>Hydrostatic Skeletons</p> Signup and view all the answers

    In which aspect do hydrostatic skeletons differ significantly from exoskeletons and endoskeletons?

    <p>Source of support for the organism</p> Signup and view all the answers

    Which primary reason limits the size and mobility of organisms with hydrostatic skeletons on land?

    <p>Inability to withstand dry conditions</p> Signup and view all the answers

    What distinguishes hydrostatic skeletons from exoskeletons and endoskeletons based on their physical characteristics?

    <p>'Flexible' fluid-filled cavities surrounded by muscles</p> Signup and view all the answers

    Which component of the musculoskeletal system plays a crucial role in converting muscle contractions into bone movement?

    <p>Tendons</p> Signup and view all the answers

    What is the primary function of antagonistic muscles in the musculoskeletal system?

    <p>Create smooth and controlled movements</p> Signup and view all the answers

    Which type of muscle tissue is consciously controlled to perform various actions like running and walking?

    <p>Striated muscle</p> Signup and view all the answers

    What is the primary function of bones in the context of locomotion?

    <p>Provide stability and support under heavy loads</p> Signup and view all the answers

    What is the main role of ligaments within joints of the musculoskeletal system?

    <p>Prevent excessive joint movements</p> Signup and view all the answers

    Which tissue covers the ends of bones at joints, reducing friction and distributing loads during movement?

    <p>Cartilage</p> Signup and view all the answers

    In terms of locomotion, what is the key function of tendons connecting muscles to bones?

    <p>Convert muscle contractions into bone movement</p> Signup and view all the answers

    Among the components mentioned, which plays a pivotal role in connecting bones and enabling their movement relative to each other?

    <p>Joints</p> Signup and view all the answers

    Which type of vertebrae connects to the ribs in the human skeleton?

    <p>Thoracic Vertebrae</p> Signup and view all the answers

    What is the primary function of cartilage in the musculoskeletal system?

    <p>Provide support and flexibility at joints</p> Signup and view all the answers

    In a synovial joint, what is the function of synovial fluid?

    <p>Reducing friction between joint surfaces</p> Signup and view all the answers

    What are tendons primarily responsible for in the musculoskeletal system?

    <p>Attaching muscles to bones</p> Signup and view all the answers

    What is the hierarchical structure crucial for nutrient and waste transport in bones?

    <p>Canaliculi system</p> Signup and view all the answers

    Which type of joint allows no movement and is mainly present in the skull bones?

    <p>Fibrous joints</p> Signup and view all the answers

    What is the primary purpose of antagonistic muscles in controlling movement?

    <p>Controlling muscle contraction and relaxation</p> Signup and view all the answers

    What is the primary role of calcium ions in muscle contraction?

    <p>To regulate the sliding of myosin filaments over actin filaments</p> Signup and view all the answers

    Which statement best describes the role of mitochondria in muscle fibers?

    <p>They generate adenosine triphosphate (ATP) through cellular respiration</p> Signup and view all the answers

    What is the primary difference between osteoarthritis and rheumatoid arthritis?

    <p>Osteoarthritis is caused by mechanical wear and tear, while rheumatoid arthritis is an autoimmune disorder</p> Signup and view all the answers

    Which statement best describes the function of the sarcoplasmic reticulum in muscle cells?

    <p>It stores and releases calcium ions crucial for muscle contraction</p> Signup and view all the answers

    What is the primary role of hormonal changes in the development of osteoporosis in postmenopausal women?

    <p>Decreased estrogen levels lead to increased bone resorption</p> Signup and view all the answers

    What is the primary role of the myosin heads during muscle contraction?

    <p>To bind to actin and undergo a power stroke, pulling the actin filaments inward</p> Signup and view all the answers

    What is the primary cause of rickets in children, aside from vitamin D deficiency?

    <p>Deficiency in calcium and phosphorus</p> Signup and view all the answers

    Which statement best describes the role of physical inactivity in the development of osteoporosis?

    <p>Physical inactivity leads to decreased bone formation</p> Signup and view all the answers

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