18_Muscular System and Muscle Tissue

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Questions and Answers

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?

Elasticity

Excitability (correct)

Extensibility

Contractility

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?

Involuntary movements Signup and view all the answers

Which of these is not responsible for involuntary movements?

Skeletal Signup and view all the answers

What property of muscle tissue allows it to be stretched beyond resting length?

Extensibility Signup and view all the answers

Which type of muscle tissue is responsible for facial expressions?

Skeletal Signup and view all the answers

What property of muscle tissue allows it to return to resting length after shortening or lengthening?

Elasticity Signup and view all the answers

Which type of muscle tissue is responsible for regulating materials entering/exiting the body?

Smooth Signup and view all the answers

What property of muscle tissue allows it to generate a pulling force?

Contractility Signup and view all the answers

Which type of muscle contraction refers to constant tension and changing length?

Isotonic contraction Signup and view all the answers

What is the main function of a tendon?

To attach muscle to bone, skin, or another muscle Signup and view all the answers

What is the principal muscle involved in an action known as?

Agonist Signup and view all the answers

What refers to the constant tension in a resting muscle?

Muscle tone Signup and view all the answers

Which connective tissue layer surrounds individual muscle fibers to provide electrical insulation?

Endomysium Signup and view all the answers

What type of muscle contraction has a constant length and changing tension?

Isotonic contraction Signup and view all the answers

What is the function of the epimysium?

Surrounds entire muscle; separates muscle from other tissues and organs Signup and view all the answers

Which muscle attachments move the appendicular skeleton?

Proximal & distal attachment Signup and view all the answers

Which muscle attachment moves the axial skeleton?

Superior & Inferior attachment Signup and view all the answers

Which type of muscle contraction causes lengthening of the muscle?

Eccentric contraction Signup and view all the answers

What type of muscle tissue is found in internal organs?

Smooth muscle tissue Signup and view all the answers

Which type of muscle tissue is voluntary and multinucleate?

Skeletal muscle tissue Signup and view all the answers

What are the functional units of muscle contraction?

Sarcomeres Signup and view all the answers

What is the role of the neuromuscular junction (NMJ) in muscle contraction?

Determination of force and specificity of movement Signup and view all the answers

What triggers the release of calcium in the muscle fiber during muscle contraction?

Release of acetylcholine at the NMJ Signup and view all the answers

What happens to the Z discs during muscle fiber contraction?

They come closer together, shortening the sarcomere Signup and view all the answers

What principle dictates that when a motor unit is stimulated, all muscle fibers within it contract?

All-or-none principle Signup and view all the answers

What drives the interaction of thick and thin filaments within sarcomeres during muscle contraction?

Release of calcium and ATP in muscle fibers Signup and view all the answers

What determines the force and specificity of movement in skeletal muscles?

Size of motor units Signup and view all the answers

What are the components of a sarcomere?

Z discs, I band, H band, A band Signup and view all the answers

Voluntary muscle tissue is also known as smooth muscle tissue

False Signup and view all the answers

Skeletal muscle tissue is capable of returning to its resting length after being stretched

True Signup and view all the answers

Cardiac muscle tissue is only found in the heart

True Signup and view all the answers

Skeletal muscle fibers are striated and multinucleated

True Signup and view all the answers

Smooth muscle tissue is responsible for locomotion and posture

False Signup and view all the answers

The main function of skeletal muscle is to regulate materials entering and exiting the body

True Signup and view all the answers

Skeletal muscle tissue is excitable and contractile

True Signup and view all the answers

Cardiac muscle tissue is involuntary and striated

True Signup and view all the answers

Smooth muscle tissue is attached to bones of the skeleton

False Signup and view all the answers

Skeletal muscle tissue is only capable of voluntary movements

True Signup and view all the answers

Muscle tone refers to the constant length of a resting muscle.

False Signup and view all the answers

Isometric contraction causes the length of the muscle to change while the tension remains constant.

False Signup and view all the answers

The less movable attachment of a muscle is called the insertion.

False Signup and view all the answers

The deep fascia separates individual muscles, while the superficial fascia separates the skeletal muscle from the skin.

True Signup and view all the answers

The epimysium surrounds individual muscle fibers to provide electrical insulation.

False Signup and view all the answers

Agonist muscles are responsible for producing flexion, while antagonist muscles produce extension.

False Signup and view all the answers

Tendons are a type of dense irregular connective tissue.

False Signup and view all the answers

The origin is the more moveable attachment while the insertion is the less moveable attachment.

False Signup and view all the answers

The I band and H band lengthen while the A band stays the same during muscle contraction.

False Signup and view all the answers

Isotonic contraction refers to a type of muscle contraction where tension is constant and length is changing.

True Signup and view all the answers

Cardiac muscle tissue contains multinucleated cells

False Signup and view all the answers

The neuromuscular junction (NMJ) determines the force and specificity of movement in skeletal muscles

False Signup and view all the answers

The I band of a sarcomere contains only thick filaments

False Signup and view all the answers

Smooth muscle tissue contains visible striations

False Signup and view all the answers

The sliding filament model of muscle contraction involves the release of acetylcholine at the NMJ

True Signup and view all the answers

The Z discs move further apart during muscle fiber contraction

False Signup and view all the answers

The all-or-none principle dictates that when a motor unit is stimulated, only some muscle fibers within it contract

False Signup and view all the answers

The size of motor units has no effect on the force and specificity of movement in skeletal muscles

False Signup and view all the answers

Muscle contraction involves the interaction of thick and thin filaments within sarcomeres, driven by the release of calcium and ATP in muscle fibers

True Signup and view all the answers

The A band of a sarcomere contains both thick and thin filaments

True Signup and view all the answers

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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Test your knowledge of muscle tissue and contraction with this quiz. Learn about the characteristics of cardiac, smooth, and skeletal muscle tissue, the structure of myofibrils and sarcomeres, the neuromuscular junction, and the sliding filament model of muscle contraction.

18_Muscular System and Muscle Tissue

Podcast Beta

Questions and Answers

Which type of muscle tissue is characterized by being attached to bones of the skeleton?

What property allows muscle tissue to respond to a stimulus?

Which type of muscle tissue is striated and multinucleated?

Which of these is not a main function of skeletal muscle?

Which of these is not responsible for involuntary movements?

What property of muscle tissue allows it to be stretched beyond resting length?

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?

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?

Which type of muscle contraction refers to constant tension and changing length?

What is the main function of a tendon?

What is the principal muscle involved in an action known as?

What refers to the constant tension in a resting muscle?

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 is the function of the epimysium?

Which muscle attachments move the appendicular skeleton?

Which muscle attachment moves the axial skeleton?

Which type of muscle contraction causes lengthening of the muscle?

What type of muscle tissue is found in internal organs?

Which type of muscle tissue is voluntary and multinucleate?

What are the functional units of 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 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 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 are the components of a sarcomere?

Voluntary muscle tissue is also known as smooth muscle tissue

Skeletal muscle tissue is capable of returning to its resting length after being stretched

Cardiac muscle tissue is only found in the heart

Skeletal muscle fibers are striated and multinucleated

Smooth muscle tissue is responsible for locomotion and posture

The main function of skeletal muscle is to regulate materials entering and exiting the body

Skeletal muscle tissue is excitable and contractile

Cardiac muscle tissue is involuntary and striated

Smooth muscle tissue is attached to bones of the skeleton

Skeletal muscle tissue is only capable of voluntary movements

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.

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 epimysium surrounds individual muscle fibers to provide electrical insulation.

Agonist muscles are responsible for producing flexion, while antagonist muscles produce extension.

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 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.

Cardiac muscle tissue contains multinucleated cells

The neuromuscular junction (NMJ) determines the force and specificity of movement in skeletal muscles

The I band of a sarcomere contains only thick filaments

Smooth muscle tissue contains visible striations

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 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

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

Study Notes

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