Podcast
Questions and Answers
What type of muscle insertion favors speed of movement at a joint?
What type of muscle insertion favors speed of movement at a joint?
Which filaments are found exclusively in the H zone of a sarcomere?
Which filaments are found exclusively in the H zone of a sarcomere?
What role do troponin and tropomyosin play in muscle contraction?
What role do troponin and tropomyosin play in muscle contraction?
How does the position of the fulcrum affect muscle movement?
How does the position of the fulcrum affect muscle movement?
Signup and view all the answers
What is the primary structural unit of muscle fibers?
What is the primary structural unit of muscle fibers?
Signup and view all the answers
What is the primary role of skeletal muscle fibers?
What is the primary role of skeletal muscle fibers?
Signup and view all the answers
What causes the striated appearance of skeletal muscle?
What causes the striated appearance of skeletal muscle?
Signup and view all the answers
How are skeletal muscle cells held together?
How are skeletal muscle cells held together?
Signup and view all the answers
What is the function of motor neurons in relation to skeletal muscle?
What is the function of motor neurons in relation to skeletal muscle?
Signup and view all the answers
What is the sliding filament theory primarily concerned with?
What is the sliding filament theory primarily concerned with?
Signup and view all the answers
Which of the following statements about muscle fibers is correct?
Which of the following statements about muscle fibers is correct?
Signup and view all the answers
Which muscle is primarily responsible for rotational movement in the human shoulder joint?
Which muscle is primarily responsible for rotational movement in the human shoulder joint?
Signup and view all the answers
What happens to skeletal muscle during contraction?
What happens to skeletal muscle during contraction?
Signup and view all the answers
What is the main function of a hydrostatic skeleton?
What is the main function of a hydrostatic skeleton?
Signup and view all the answers
What must organisms with an exoskeleton do in order to grow?
What must organisms with an exoskeleton do in order to grow?
Signup and view all the answers
Which of the following is NOT a function of an exoskeleton?
Which of the following is NOT a function of an exoskeleton?
Signup and view all the answers
Which type of skeleton is most likely to be involved in locomotion through changes in pressure?
Which type of skeleton is most likely to be involved in locomotion through changes in pressure?
Signup and view all the answers
Which organisms typically possess a hydrostatic skeleton?
Which organisms typically possess a hydrostatic skeleton?
Signup and view all the answers
How do muscles function in relation to the cuticle in arthropods?
How do muscles function in relation to the cuticle in arthropods?
Signup and view all the answers
How does an exoskeleton provide leverage for muscle contraction?
How does an exoskeleton provide leverage for muscle contraction?
Signup and view all the answers
What primary function do the muscles attached to an exoskeleton serve?
What primary function do the muscles attached to an exoskeleton serve?
Signup and view all the answers
What is the main function of the endoskeleton in vertebrates?
What is the main function of the endoskeleton in vertebrates?
Signup and view all the answers
Which of the following statements about endoskeletons is true?
Which of the following statements about endoskeletons is true?
Signup and view all the answers
Which material primarily makes up the endoskeleton in vertebrates?
Which material primarily makes up the endoskeleton in vertebrates?
Signup and view all the answers
What are the two main divisions of the human skeleton?
What are the two main divisions of the human skeleton?
Signup and view all the answers
What is found in the spaces of spongy bone?
What is found in the spaces of spongy bone?
Signup and view all the answers
What characteristic differentiates compact bone from spongy bone?
What characteristic differentiates compact bone from spongy bone?
Signup and view all the answers
Which of the following best describes bone tissue?
Which of the following best describes bone tissue?
Signup and view all the answers
What type of skeleton do echinoderms possess?
What type of skeleton do echinoderms possess?
Signup and view all the answers
What physiological process is primarily regulated by calcium ions (Ca2+) in vertebrates?
What physiological process is primarily regulated by calcium ions (Ca2+) in vertebrates?
Signup and view all the answers
Which type of muscle is characterized as striated and voluntary?
Which type of muscle is characterized as striated and voluntary?
Signup and view all the answers
Which type of muscle contraction is primarily controlled by the nervous system?
Which type of muscle contraction is primarily controlled by the nervous system?
Signup and view all the answers
How are calcium ions involved in bone metabolism?
How are calcium ions involved in bone metabolism?
Signup and view all the answers
What is the primary characteristic of cardiac muscle?
What is the primary characteristic of cardiac muscle?
Signup and view all the answers
What mechanism primarily maintains blood calcium ion (Ca2+) levels?
What mechanism primarily maintains blood calcium ion (Ca2+) levels?
Signup and view all the answers
Which of the following statements about muscle contraction is true?
Which of the following statements about muscle contraction is true?
Signup and view all the answers
What is the role of actin in muscle contraction?
What is the role of actin in muscle contraction?
Signup and view all the answers
Flashcards
Myofibrils
Myofibrils
Extensions of muscle cells that attach to cuticle.
Cuticle
Cuticle
Outer covering that muscles attach to in some animals.
Endoskeleton
Endoskeleton
Internal support structure like bones within an organism.
Axial Skeleton
Axial Skeleton
Signup and view all the flashcards
Appendicular Skeleton
Appendicular Skeleton
Signup and view all the flashcards
Compact Bone
Compact Bone
Signup and view all the flashcards
Spongy Bone
Spongy Bone
Signup and view all the flashcards
Bone Marrow
Bone Marrow
Signup and view all the flashcards
Antagonistic pairs
Antagonistic pairs
Signup and view all the flashcards
Proximal insertion
Proximal insertion
Signup and view all the flashcards
Distal insertion
Distal insertion
Signup and view all the flashcards
Sliding filament theory
Sliding filament theory
Signup and view all the flashcards
Hydrostatic Skeleton
Hydrostatic Skeleton
Signup and view all the flashcards
Ecdysis
Ecdysis
Signup and view all the flashcards
Muscle Structure
Muscle Structure
Signup and view all the flashcards
Muscle Physiology
Muscle Physiology
Signup and view all the flashcards
Lever Systems in Muscles
Lever Systems in Muscles
Signup and view all the flashcards
Sarcomeres
Sarcomeres
Signup and view all the flashcards
Calcium Homeostasis
Calcium Homeostasis
Signup and view all the flashcards
Neurotransmitters
Neurotransmitters
Signup and view all the flashcards
Endocrine Feedback Loops
Endocrine Feedback Loops
Signup and view all the flashcards
Striated Muscle
Striated Muscle
Signup and view all the flashcards
Smooth Muscle
Smooth Muscle
Signup and view all the flashcards
Skeletal Muscle
Skeletal Muscle
Signup and view all the flashcards
Contractile Cells
Contractile Cells
Signup and view all the flashcards
Myogenic Contraction
Myogenic Contraction
Signup and view all the flashcards
Muscle Fibres
Muscle Fibres
Signup and view all the flashcards
Myoblasts
Myoblasts
Signup and view all the flashcards
Ca2+ in Muscles
Ca2+ in Muscles
Signup and view all the flashcards
Connective Tissue
Connective Tissue
Signup and view all the flashcards
Motor Neurons
Motor Neurons
Signup and view all the flashcards
Muscle Contraction
Muscle Contraction
Signup and view all the flashcards
Study Notes
Animal Locomotion: Skeleton & Muscles
- Animal skeletons categorized into hydrostatic, exoskeleton, and endoskeleton
- Hydrostatic skeletons are fluid-filled compartments providing support and movement
- Exoskeletons are rigid external coverings that need to be shed (ecdysis) for growth, providing limited protection and support
- Endoskeletons are internal rigid structures, providing support and protection; in vertebrates they are the primary skeletal system
- Bone tissue is a complex organ composed of nerves, blood vessels, and bone tissue
- Compact bone, the outer layer of bone, has few microscopic spaces
- Spongy bone, the inner layer, has open spaces filled with marrow
Bone Tissue
- Two types of marrow: red, which produces red blood cells; yellow, which is adipose tissue with limited life span
- Calcium and phosphate ions are constantly deposited and withdrawn from bones.
- Hormonal controls regulate Ca2+ ions at optimal levels in blood and extracellular fluids. This is known as homeostasis
Types of Muscles
- Vertebrates have three types of muscles: skeletal, cardiac, and smooth
- Skeletal muscles are voluntary, striated, and neurogenic, stimulated by the nervous system; these are responsible for movement of the body
- Cardiac muscle is involuntary, striated, and myogenic, stimulated by the muscle itself
- Smooth muscle is involuntary, unstriated, and myogenic, stimulated by the muscle itself
Skeletal Muscle Structure
- Skeletal muscles are bundles of elongated muscle fibers. Individual muscle fibers are composed of multiple myofibrils
- Muscle fibers contain multiple nuclei
- Myofibrils are composed of many sarcomeres, the repeating functional units of a muscle and within a sarcomere are myosin and actin filaments. Organized protein arrangement creates the striated appearance
- The interaction between actin and myosin proteins results in muscle contraction. The sliding filament theory describes how these interactions create muscle contraction. The motor neuron stimulates the contraction of the muscle
- Muscle contraction is stimulated by motor neurons from the somatic nervous system
- Actin, myosin, and other proteins are involved in muscle contraction
Muscle Physiology
- Muscle shortening generates force & movement, dependent on the location where the muscle is attached to the skeleton (as if on a lever)
- Skeletal muscle actively shortens but passively relaxes
- Muscles generally grouped as antagonistic pairs around joints
- Muscles can be attached proximal (closer) ot the joint or distal from the joint; proximal insertion favors speed while distal favors strength
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
Test your knowledge on muscle anatomy, contraction mechanisms, and the various types of muscle fibers. This quiz covers concepts related to muscle structure, movement, and the role of motor neurons. Understand the fundamental principles that govern muscle function.