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Questions and Answers
Which type of muscle tissue is characterized by being attached to bones of the skeleton?
Which type of muscle tissue is characterized by being attached to bones of the skeleton?
- Striated
- Smooth
- Skeletal (correct)
- Cardiac
What property allows muscle tissue to respond to a stimulus?
What property allows muscle tissue to respond to a stimulus?
- Elasticity
- Excitability (correct)
- Extensibility
- Contractility
Which type of muscle tissue is striated and multinucleated?
Which type of muscle tissue is striated and multinucleated?
- Skeletal (correct)
- Voluntary
- Smooth
- Cardiac
Which of these is not a main function of skeletal muscle?
Which of these is not a main function of skeletal muscle?
Which of these is not responsible for involuntary movements?
Which of these is not responsible for involuntary movements?
What property of muscle tissue allows it to be stretched beyond resting length?
What property of muscle tissue allows it to be stretched beyond resting length?
Which type of muscle tissue is responsible for facial expressions?
Which type of muscle tissue is responsible for facial expressions?
What property of muscle tissue allows it to return to resting length after shortening or lengthening?
What property of muscle tissue allows it to return to resting length after shortening or lengthening?
Which type of muscle tissue is responsible for regulating materials entering/exiting the body?
Which type of muscle tissue is responsible for regulating materials entering/exiting the body?
What property of muscle tissue allows it to generate a pulling force?
What property of muscle tissue allows it to generate a pulling force?
Which type of muscle contraction refers to constant tension and changing length?
Which type of muscle contraction refers to constant tension and changing length?
What is the main function of a tendon?
What is the main function of a tendon?
What is the principal muscle involved in an action known as?
What is the principal muscle involved in an action known as?
What refers to the constant tension in a resting muscle?
What refers to the constant tension in a resting muscle?
Which connective tissue layer surrounds individual muscle fibers to provide electrical insulation?
Which connective tissue layer surrounds individual muscle fibers to provide electrical insulation?
What type of muscle contraction has a constant length and changing tension?
What type of muscle contraction has a constant length and changing tension?
What is the function of the epimysium?
What is the function of the epimysium?
Which muscle attachments move the appendicular skeleton?
Which muscle attachments move the appendicular skeleton?
Which muscle attachment moves the axial skeleton?
Which muscle attachment moves the axial skeleton?
Which type of muscle contraction causes lengthening of the muscle?
Which type of muscle contraction causes lengthening of the muscle?
What type of muscle tissue is found in internal organs?
What type of muscle tissue is found in internal organs?
Which type of muscle tissue is voluntary and multinucleate?
Which type of muscle tissue is voluntary and multinucleate?
What are the functional units of muscle contraction?
What are the functional units of muscle contraction?
What is the role of the neuromuscular junction (NMJ) in muscle contraction?
What is the role of the neuromuscular junction (NMJ) in muscle contraction?
What triggers the release of calcium in the muscle fiber during muscle contraction?
What triggers the release of calcium in the muscle fiber during muscle contraction?
What happens to the Z discs during muscle fiber contraction?
What happens to the Z discs during muscle fiber contraction?
What principle dictates that when a motor unit is stimulated, all muscle fibers within it contract?
What principle dictates that when a motor unit is stimulated, all muscle fibers within it contract?
What drives the interaction of thick and thin filaments within sarcomeres during muscle contraction?
What drives the interaction of thick and thin filaments within sarcomeres during muscle contraction?
What determines the force and specificity of movement in skeletal muscles?
What determines the force and specificity of movement in skeletal muscles?
What are the components of a sarcomere?
What are the components of a sarcomere?
Voluntary muscle tissue is also known as smooth muscle tissue
Voluntary muscle tissue is also known as smooth muscle tissue
Skeletal muscle tissue is capable of returning to its resting length after being stretched
Skeletal muscle tissue is capable of returning to its resting length after being stretched
Cardiac muscle tissue is only found in the heart
Cardiac muscle tissue is only found in the heart
Skeletal muscle fibers are striated and multinucleated
Skeletal muscle fibers are striated and multinucleated
Smooth muscle tissue is responsible for locomotion and posture
Smooth muscle tissue is responsible for locomotion and posture
The main function of skeletal muscle is to regulate materials entering and exiting the body
The main function of skeletal muscle is to regulate materials entering and exiting the body
Skeletal muscle tissue is excitable and contractile
Skeletal muscle tissue is excitable and contractile
Cardiac muscle tissue is involuntary and striated
Cardiac muscle tissue is involuntary and striated
Smooth muscle tissue is attached to bones of the skeleton
Smooth muscle tissue is attached to bones of the skeleton
Skeletal muscle tissue is only capable of voluntary movements
Skeletal muscle tissue is only capable of voluntary movements
Muscle tone refers to the constant length of a resting muscle.
Muscle tone refers to the constant length of a resting muscle.
Isometric contraction causes the length of the muscle to change while the tension remains constant.
Isometric contraction causes the length of the muscle to change while the tension remains constant.
The less movable attachment of a muscle is called the insertion.
The less movable attachment of a muscle is called the insertion.
The deep fascia separates individual muscles, while the superficial fascia separates the skeletal muscle from the skin.
The deep fascia separates individual muscles, while the superficial fascia separates the skeletal muscle from the skin.
The epimysium surrounds individual muscle fibers to provide electrical insulation.
The epimysium surrounds individual muscle fibers to provide electrical insulation.
Agonist muscles are responsible for producing flexion, while antagonist muscles produce extension.
Agonist muscles are responsible for producing flexion, while antagonist muscles produce extension.
Tendons are a type of dense irregular connective tissue.
Tendons are a type of dense irregular connective tissue.
The origin is the more moveable attachment while the insertion is the less moveable attachment.
The origin is the more moveable attachment while the insertion is the less moveable attachment.
The I band and H band lengthen while the A band stays the same during muscle contraction.
The I band and H band lengthen while the A band stays the same during muscle contraction.
Isotonic contraction refers to a type of muscle contraction where tension is constant and length is changing.
Isotonic contraction refers to a type of muscle contraction where tension is constant and length is changing.
Cardiac muscle tissue contains multinucleated cells
Cardiac muscle tissue contains multinucleated cells
The neuromuscular junction (NMJ) determines the force and specificity of movement in skeletal muscles
The neuromuscular junction (NMJ) determines the force and specificity of movement in skeletal muscles
The I band of a sarcomere contains only thick filaments
The I band of a sarcomere contains only thick filaments
Smooth muscle tissue contains visible striations
Smooth muscle tissue contains visible striations
The sliding filament model of muscle contraction involves the release of acetylcholine at the NMJ
The sliding filament model of muscle contraction involves the release of acetylcholine at the NMJ
The Z discs move further apart during muscle fiber contraction
The Z discs move further apart during muscle fiber contraction
The all-or-none principle dictates that when a motor unit is stimulated, only some muscle fibers within it contract
The all-or-none principle dictates that when a motor unit is stimulated, only some muscle fibers within it contract
The size of motor units has no effect on the force and specificity of movement in skeletal muscles
The size of motor units has no effect on the force and specificity of movement in skeletal muscles
Muscle contraction involves the interaction of thick and thin filaments within sarcomeres, driven by the release of calcium and ATP in muscle fibers
Muscle contraction involves the interaction of thick and thin filaments within sarcomeres, driven by the release of calcium and ATP in muscle fibers
The A band of a sarcomere contains both thick and thin filaments
The A band of a sarcomere contains both thick and thin filaments
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Study Notes
Muscle Tissue and Contraction
- Cardiac muscle tissue is found in the heart and consists of Y-shaped, short, striated, single-nucleated cells called cardiomyocytes.
- Smooth muscle tissue, found in internal organs, contains fusiform, involuntary myocytes without visible striations.
- Skeletal muscle tissue, which is voluntary and multinucleate, is made up of long, cylindrical muscle fibers with sarcolemma, sarcoplasm, sarcoplasmic reticulum, and myofibrils.
- Myofibrils contain myofilaments, including thin filaments made of actin and thick filaments made of myosin, and are divided into sarcomeres, the functional units of muscle contraction.
- A sarcomere contains overlapping thick and thin filaments, delimited by Z discs and anchored by the M line, with the I band containing only thin filaments, the H band containing only thick filaments, and the A band containing both.
- The neuromuscular junction (NMJ) is where a motor neuron’s axon terminal meets the muscle fiber, forming a motor unit that determines the force and specificity of movement.
- The NMJ consists of a synaptic knob, synaptic vesicles filled with acetylcholine, a synaptic cleft, and a motor end plate with acetylcholine receptors.
- The sliding filament model of muscle contraction involves the release of acetylcholine at the NMJ, triggering the release of calcium in the muscle fiber, activating thick filaments to pull on thin filaments, leading to muscle fiber and skeletal muscle contraction.
- The Z discs come closer together during muscle fiber contraction, shortening the sarcomere and causing the entire muscle fiber to contract.
- The all-or-none principle dictates that when a motor unit is stimulated, all muscle fibers within it contract.
- The size of motor units determines the force and specificity of movement in skeletal muscles.
- Muscle contraction involves the interaction of thick and thin filaments within sarcomeres, driven by the release of calcium and ATP in muscle fibers.
Muscle Tissue and Contraction
- Cardiac muscle tissue is found in the heart and consists of Y-shaped, short, striated, single-nucleated cells called cardiomyocytes.
- Smooth muscle tissue, found in internal organs, contains fusiform, involuntary myocytes without visible striations.
- Skeletal muscle tissue, which is voluntary and multinucleate, is made up of long, cylindrical muscle fibers with sarcolemma, sarcoplasm, sarcoplasmic reticulum, and myofibrils.
- Myofibrils contain myofilaments, including thin filaments made of actin and thick filaments made of myosin, and are divided into sarcomeres, the functional units of muscle contraction.
- A sarcomere contains overlapping thick and thin filaments, delimited by Z discs and anchored by the M line, with the I band containing only thin filaments, the H band containing only thick filaments, and the A band containing both.
- The neuromuscular junction (NMJ) is where a motor neuron’s axon terminal meets the muscle fiber, forming a motor unit that determines the force and specificity of movement.
- The NMJ consists of a synaptic knob, synaptic vesicles filled with acetylcholine, a synaptic cleft, and a motor end plate with acetylcholine receptors.
- The sliding filament model of muscle contraction involves the release of acetylcholine at the NMJ, triggering the release of calcium in the muscle fiber, activating thick filaments to pull on thin filaments, leading to muscle fiber and skeletal muscle contraction.
- The Z discs come closer together during muscle fiber contraction, shortening the sarcomere and causing the entire muscle fiber to contract.
- The all-or-none principle dictates that when a motor unit is stimulated, all muscle fibers within it contract.
- The size of motor units determines the force and specificity of movement in skeletal muscles.
- Muscle contraction involves the interaction of thick and thin filaments within sarcomeres, driven by the release of calcium and ATP in muscle fibers.
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