Q: During muscle contraction, which equation best represents the hydrolysis of ATP to provide energy?

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i + \text{energy}$$

Question 1

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

Accepted Answer

Production of blood cells

Question 2

A patient is diagnosed with a disorder affecting the intercalated discs in their muscle tissue. Which type of muscle is most likely affected?

Accepted Answer

Cardiac muscle

Question 3

Which of the following best describes the location and function of smooth muscle?

Accepted Answer

Found in the walls of hollow organs; controls involuntary movements

Question 4

Compare and contrast the characteristics of skeletal, cardiac, and smooth muscle. Which statement is correct?

Accepted Answer

Cardiac muscle is striated and involuntary, while skeletal muscle is striated and voluntary

Question 5

Which connective tissue layer surrounds an individual muscle fiber?

Accepted Answer

Endomysium

Question 6

A muscle fiber is stimulated by a motor neuron. What is the correct sequence of events leading to muscle contraction?

Accepted Answer

Action potential arrives at neuromuscular junction → Acetylcholine released → Sarcolemma depolarizes → Calcium released from sarcoplasmic reticulum → Cross-bridge formation

Question 7

Which protein directly blocks the binding of myosin to actin in a relaxed muscle fiber?

Accepted Answer

Tropomyosin

Question 8

During muscle contraction, which equation best represents the hydrolysis of ATP to provide energy?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy}$$

Question 9

Which of the following best describes the role of the sarcoplasmic reticulum in muscle contraction?

Accepted Answer

It stores and releases calcium ions necessary for contraction

Question 10

A sprinter relies primarily on which type of muscle fiber for explosive speed?

Accepted Answer

Fast glycolytic fibers

Question 11

Which of the following is a correct description of a motor unit?

Accepted Answer

A single motor neuron and all the muscle fibers it innervates

Question 12

Which process is responsible for the removal of acetylcholine from the synaptic cleft at the neuromuscular junction?

Accepted Answer

Enzymatic breakdown by acetylcholinesterase

Question 13

Which connective tissue structure bundles muscle fibers into fascicles?

Accepted Answer

Perimysium

Question 14

Which of the following is true regarding the sliding filament theory of muscle contraction?

Accepted Answer

Myosin heads bind to actin and pull the thin filaments toward the center of the sarcomere

Question 15

Which of the following best explains why cardiac muscle cells do not fatigue as quickly as skeletal muscle cells?

Accepted Answer

Cardiac muscle cells have more mitochondria and rely primarily on aerobic metabolism

Question 16

A patient with myasthenia gravis has impaired neuromuscular transmission. Which part of the neuromuscular junction is most likely affected?

Accepted Answer

Acetylcholine receptors on the muscle fiber membrane

Question 17

Which of the following is a regulatory protein in muscle contraction?

Accepted Answer

Troponin

Question 18

Which equation best represents the relationship between force, cross-sectional area, and muscle tension?

Accepted Answer

$$F = \sigma 	imes A$$

Question 19

Which of the following mechanisms do muscle fibers use to obtain ATP for contraction during prolonged exercise?

Accepted Answer

Aerobic respiration of glucose

Question 20

Which type of muscle tissue is responsible for peristalsis in the digestive tract?

Accepted Answer

Smooth muscle

Muscular System: Structure, Function, and Physiology Study Notes

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