What creates the alternating light and dark bands that provides the striation pattern on skeletal muscle tissue?

Think filaments and myosin heads

A sarcomere is ________.

The contractile unit between two Z discs

The wavy lines on the cell, as seen in a microscope

The area between two intercalated discs

What structure is the functional unit of contraction in a skeletal muscle fiber?

The junctional folds of the sarcolemma

After a power stroke, the myosin head must detach from actin before another power stroke can occur. What causes cross bridge detachment?

Acetylcholine binds to receptors in the junctional folds of the sarcolemma

ADP and inorganic phosphate are bound to the myosin head.

What specific event triggers the uncovering of the myosin binding site on actin?

Calcium ions bind to troponin and change its shape.

Calcium release channels open in the sarcoplasmic reticulum, and calcium levels rise in the sarcoplasm.

Sodium ions bind to troponin and change its shape.

Calcium ions bind to tropomyosin and change its shape.

What is the function of creatine phosphate?

directly regenerates ATP from ADP within a muscle cell

makes oxygen available for aerobic respiration

According to the sliding filament theory, how does muscle contraction occur?

Myosin heads form cross bridges and pull thin filaments, causing them to slide.

Both thick and thin filaments shorten as the muscle contracts.

A bands bunch up and shorten as myosin heads attach to thin filaments.

Myosin heads attach and detach from thin fi laments, causing thin filaments to shorten.

A smooth, sustained contraction, with no evidence of relaxation, is called ________.

unfused, or incomplete, tetanus

Why are calcium ions necessary for skeletal muscle contraction?

Calcium ions trigger the binding of myosin heads to actin fi laments.

Calcium ions cause ATP binding to actin.

Calcium ions release the inhibition on Z discs.

Calcium ions bind to regulatory proteins on the myosin fi laments, changing both their shape and their position on the thick fi laments.

The condition of skeletal muscle fatigue can be best explained by ________.

the inability of the muscle to contract even if it is being stimulated

a total lack of ATP in the body

inadequate numbers of mitochondria in muscle cells

The mechanical force of contraction is generated by ________.

a sliding of thin filaments past thick filaments

the temporary disappearance of thin filaments

the "accordian-like" folding of thin and thick filaments

shortening of the thick filaments

A skeletal muscle twitch differs from a tetanic contraction in that ________.

the muscle twitch is a brief and "jerky" movement, while the tetanic contraction is prolonged and continuous

the muscle twitch occurs only in small muscles while a tetanic contraction occurs in large muscle groups

the tetanic contraction is considered abnormal, while the twitch is a normal muscle response

the tetanic contraction is caused by a single stimulus, while the twitch is caused by very rapid multiple stimuli

Creatine phosphate (CP) functions within the muscle cells by ________.

storing energy that will be transferred to ADP to resynthesize ATP as needed

forming a temporary chemical compound with myosin

forming a chemical compound with actin

inducing a conformational change in the myofi laments

Which of the following is an example of an isometric contraction?

pushing against an immovable wall

nodding the head as to say "yes"

shaking the head as to say "no"

EGTA is a substance that binds calcium ions. Imagine an experimental setup with a motor neuron and a muscle fiber. Stimulation of the motor neuron causescontraction of the muscle fiber through activity at the neuromuscular junction and excitation-contraction coupling. Now, inject the muscle fiber with EGTA. Which ofthe following effects would EGTA have on excitation-contraction coupling after the neuron releases acetylcholine at the neuromuscular junction?

It would prevent myosin from forming cross bridges with actin.

It would prevent the release of calcium ions from the terminal cisterns.

It would prevent the junctional folds from triggering an action potential.

It would prevent conduction of an action potential along the sarcolemma.

Which of the following is NOT a role of ATP in muscle contraction?

Exposing myosin binding sites on actin

Detaching the cross bridge from actin

Energizing the power stroke of the cross bridge

Transporting calcium ions into the sarcoplasmic reticulum

Rank the sequence of cross bridge cycling, starting with the myosin-binding sites being exposed and ending with relaxation due to cross bridge cycling ending. Do not overlap any events.

Myosin head forms cross bridge with actin

Power stroke moves thin filament

Cross bridges detach from actin

A muscle inserts on which of the following?

the bone that moves when the muscle contracts

the bone that does not move when the muscle contracts

Muscle System Assessment Review

Authored by Kyle Manuel

Science

11th Grade

NGSS covered

Used 15+ times

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MULTIPLE CHOICE QUESTION

Hydrolysis of creatine phosphate

Krebs cycle and oxidative phosphorylation

Glycolysis

The A band within a myofibril is indicated by ________.

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Muscle System Assessment Review

The striations seen in skeletal muscle are actually alternating dark A and light I bands.

The binding of calcium to which molecule causes the myosin binding sites to be exposed?

A myosin head binds to which molecule to form a cross bridge?

What causes the myosin head to disconnect from actin?

What causes the power stroke?

Which of the following processes produces the most ATP?

The A band within a myofibril is indicated by ________.

What creates the alternating light and dark bands that provides the striation pattern on skeletal muscle tissue?

Which one of the following is composed mostly of the protein myosin?

The I band within a skeletal muscle fiber is indicated by ________.

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