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Exam 9: Muscles and Muscle Tissue

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Question 31

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What is the functional role of the T tubules?

A) enhance cellular communication during muscle contraction
B) synthesize ATP to provide energy for muscle contraction
C) hold cross bridges in place in a resting muscle
D) stabilize the G and F actin

E) B) and C)
F) C) and D)

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Question 32

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Although all the anatomical parts of muscle work together to give it it's characteristics, which of the following proteins listed below would be most associated with the characteristics of excitability?

A) actin of thin filaments
B) the Na+-K+ pump
C) acetylcholine receptors in the motor end plate
D) elastic (titin) filaments

E) A) and B)
F) A) and C)

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Question 33

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Addition of more myoglobin to a muscle fiber would have the largest effect on __________.

An increase in the calcium ion level in the sarcoplasm starts the sliding of the thin filaments. When the level of calcium ions declines, sliding stops.

Immediately following the arrival of the stimulus at a skeletal muscle cell there is a short period called the _________period during which the neurotransmitter is released by exocytosis, diffuses across the synaptic cleft, And binds to its receptors.

The force of muscle contraction is controlled by multiple motor unit summation or recruitment.

Creatine phosphate functions in the muscle cell by_________ .

What part of the sarcolemma contains acetylcholine receptors?

Cardiac muscle has a limited regenerative capacity.

A patient has no peristalsis in the gastrointestinal tract. Explain a possible complication of this condition.

Myasthenia gravis is a disease that is believed to be caused by autoimmune disorder, resulting in the loss of ACh receptors at the motor end plate of muscle fibers. Which of the following is likely to be a symptom of myasthenia gravis?

Describe how the unique contractile mechanism of smooth muscle allows it to contract and remain in a contracted state for long periods of time with relatively little energy expenditure.

When a muscle is unable to respond to stimuli temporarily, it is in which of the following periods?

A smooth, sustained contraction from rapid stimulation of skeletal muscle fibers is called__________ .

Smooth muscles relax when intracellular Ca2+ levels drop but may not cease contractions.

One of the functions of skeletal muscle contraction is production of heat.

The oxygen-binding protein found in muscle cells is __________ .

An anaerobic metabolic pathway that results in the production of two net ATPs per glucose plus two pyruvic acid molecules is __________ .

Muscle cells store more creatine phosphate than ATP resulting in the muscle having a reserve source of energy.

A motor neuron and all the muscle cells that it stimulates are referred to as a motor end plate.