Muscle Tissue and Contraction

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Questions and Answers

Which type of muscle tissue is characterized by voluntary and involuntary control?

Skeletal muscle (correct)
Cardiac muscle
Smooth muscle
Visceral muscle

Cardiac muscle is under voluntary control.

False (B)

What connective tissue layer surrounds a fascicle?

Perimysium

The plasma membrane of a muscle cell is known as the _______.

sarcolemma Signup and view all the answers

Match the muscle type with its location.

Skeletal muscle = Attached to bones Smooth muscle = Walls of hollow organs Cardiac muscle = Heart Signup and view all the answers

Which of the following is a characteristic of smooth muscle cells?

Single nucleus centrally located (C) Signup and view all the answers

Skeletal muscle contractions always require conscious thought.

False (B) Signup and view all the answers

What is the function of T tubules in muscle fibers?

Transmit electrical signals Signup and view all the answers

The ability of a muscle to shorten with force is known as _______.

contractility Signup and view all the answers

Match the connective tissue layer with its description:

Endomysium = Surrounds individual muscle fibers Perimysium = Surrounds fascicles Epimysium = Surrounds the entire muscle Signup and view all the answers

Which of the following structures stores calcium ions in muscle cells?

Sarcoplasmic reticulum (D) Signup and view all the answers

The H zone narrows during muscle contraction.

True (A) Signup and view all the answers

What is the role of ATP in muscle contraction?

Releases myosin head from actin Signup and view all the answers

The neurotransmitter released at the neuromuscular junction is _______

acetylcholine Signup and view all the answers

Match the component with its description in the sliding filament model:

Actin = Thin filament that slides during contraction Myosin = Thick filament with heads that bind to actin Sarcomere = Basic functional unit of muscle fiber Signup and view all the answers

Which ion is essential for initiating muscle contraction?

Calcium (B) Signup and view all the answers

Autorhythmic contractions are a characteristic of skeletal muscle.

False (B) Signup and view all the answers

What is the role of creatine kinase in muscle metabolism?

Transfers phosphate to ADP Signup and view all the answers

The ability of a muscle to be stretched beyond its normal resting length and still be able to contract is known as _______

extensibility Signup and view all the answers

Match the phase of muscle twitch with its defining event:

Lag phase = Time from stimulus to start of contraction Contraction phase = Cross-bridge formation and power stroke Relaxation phase = Calcium returns to sarcoplasmic reticulum Signup and view all the answers

What is the function of intercalated discs in cardiac muscle?

Join cells together and allow ion passage (A) Signup and view all the answers

Smooth muscle contraction is initiated by troponin binding to calcium.

False (B) Signup and view all the answers

What is a motor unit?

Motor neuron and muscle fibers Signup and view all the answers

______ is a characteristic of smooth muscle instead of Z disks

Dense bodies Signup and view all the answers

Match muscle type with its unique characteristics:

Skeletal = Attached to bones Smooth = Involuntary Cardiac = Intercalated disks Signup and view all the answers

Flashcards

Skeletal Muscle

Attaches muscles to bones and provides voluntary movement.

Smooth Muscle

Found in the walls of hollow organs, responsible for involuntary movements.