Q: Which equation best represents the hydrolysis of ATP during muscle contraction?

$$\mathrm{ATP} + \mathrm{H_2O} \rightarrow \mathrm{ADP} + \mathrm{P_i} + \text{energy}$$

Question 1

Which of the following best describes a key structural difference between skeletal, cardiac, and smooth muscle tissue?

Accepted Answer

Skeletal muscle fibers are striated and multinucleated, cardiac muscle fibers are striated and usually uninucleated, and smooth muscle fibers are non-striated and uninucleated.

Question 2

Which of the following is NOT a primary function of muscle tissue?

Accepted Answer

Synthesizing hormones

Question 3

A muscle fiber is composed of many myofibrils. What is the main function of the sarcoplasmic reticulum in skeletal muscle fibers?

Accepted Answer

To store and release calcium ions ($$\mathrm{Ca$$^{2+}$$}) $$necessary for muscle contraction

Question 4

During the sliding filament model of muscle contraction, which event occurs first?

Accepted Answer

Calcium ions ($$\mathrm{Ca$$^{2+}$$}) $$are released from the sarcoplasmic reticulum

Question 5

Which structure is responsible for transmitting the action potential deep into the muscle fiber?

Accepted Answer

T tubules

Question 6

At the neuromuscular junction, which neurotransmitter is released to stimulate muscle contraction?

Accepted Answer

Acetylcholine

Question 7

Which of the following best describes the process of excitation-contraction coupling in skeletal muscle?

Accepted Answer

Action potential travels along the sarcolemma, enters T tubules, triggers $$\mathrm{Ca$$^{2+}$$}$$ release, and initiates cross bridge formation.

Question 8

Which of the following is a unique feature of smooth muscle cells compared to skeletal muscle cells?

Accepted Answer

Smooth muscle cells lack T tubules and have a single, centrally located nucleus.

Question 9

Which mechanism allows smooth muscle to contract for longer periods with less energy compared to skeletal muscle?

Accepted Answer

Latch mechanism, where myosin remains attached to actin for extended periods

Question 10

A patient is experiencing muscle weakness due to impaired calcium release. Which structure is most likely affected?

Accepted Answer

Sarcoplasmic reticulum

Question 11

Which equation best represents the hydrolysis of ATP during muscle contraction?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H_2O} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy}$$

Question 12

Which of the following is TRUE regarding the anatomy of smooth muscle cells?

Accepted Answer

Smooth muscle cells are spindle-shaped and contain a single nucleus.

Question 13

Which event directly triggers the release of calcium ions ($$\mathrm{Ca$$^{2+}$$}) $$from the sarcoplasmic reticulum during muscle contraction?

Accepted Answer

Propagation of the action potential along the T tubules

Question 14

Which of the following best explains why skeletal muscle fibers are capable of rapid and forceful contractions?

Accepted Answer

They are multinucleated and have extensive sarcoplasmic reticulum for rapid calcium release.

Question 15

Which of the following is a major difference in the contractile mechanism between smooth and skeletal muscle?

Accepted Answer

Skeletal muscle contraction is regulated by troponin, while smooth muscle contraction is regulated by calmodulin.

Question 16

Which of the following scenarios best illustrates the function of muscle tissue in maintaining homeostasis?

Accepted Answer

Skeletal muscles contract to generate heat during shivering.

Question 17

During muscle contraction, what is the role of ATP in the cross bridge cycle?

Accepted Answer

ATP binds to myosin, causing it to detach from actin and reset for another cycle.

Question 18

Which of the following best describes the gross structure of a skeletal muscle?

Accepted Answer

A skeletal muscle is composed of bundles of muscle fibers called fascicles, surrounded by connective tissue layers.

Question 19

Which of the following is a plausible consequence of a defect in the T tubule system of skeletal muscle fibers?

Accepted Answer

Impaired transmission of action potentials, leading to weak or absent muscle contractions.

Question 20

Which of the following best explains why smooth muscle can sustain contractions for longer periods compared to skeletal muscle?

Accepted Answer

Smooth muscle uses the latch mechanism, allowing myosin to remain attached to actin with minimal ATP consumption.

Chapter 10 Study Guide: Muscle Tissue (ANP College Level)

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