Question 1

Which of the following statements best describes the structural differences between skeletal, cardiac, and smooth muscle cells?

Accepted Answer

Skeletal muscle cells are long, cylindrical, and multinucleate with striations; cardiac muscle cells are branching, uninucleate, striated, and joined by intercalated discs; smooth muscle cells are spindle-shaped, uninucleate, and lack striations.

Question 2

Which connective tissue wrapping surrounds a single skeletal muscle fiber?

Accepted Answer

Endomysium

Question 3

What is the primary function of the sarcoplasmic reticulum in skeletal muscle cells?

Accepted Answer

To store and release calcium ions necessary for muscle contraction

Question 4

During the sliding filament theory of muscle contraction, which event directly allows myosin heads to bind to actin?

Accepted Answer

Binding of calcium ions to regulatory proteins on thin filaments

Question 5

Which equation correctly represents the direct phosphorylation of ADP by creatine phosphate (CP) in muscle cells?

Accepted Answer

$$\mathrm{CP} + \mathrm{ADP} \rightarrow \mathrm{C} + \mathrm{ATP}$$

Question 6

A patient is experiencing muscle fatigue after prolonged exercise. Which of the following is NOT a likely contributing factor?

Accepted Answer

Increase in ATP supply

Question 7

Which type of muscle contraction occurs when muscle tension increases but the muscle does not shorten, such as when pushing your palms together?

Accepted Answer

Isometric contraction

Question 8

What is the role of acetylcholinesterase (AChE) at the neuromuscular junction?

Accepted Answer

It breaks down acetylcholine, ending muscle contraction.

Question 9

Which of the following best explains why skeletal muscle is considered voluntary?

Accepted Answer

It is the only muscle tissue subject to conscious control.

Question 10

Which process is responsible for the 'all-or-none' response in individual muscle fibers?

Accepted Answer

Each muscle fiber contracts to its fullest extent when adequately stimulated.

Question 11

Which pathway provides the greatest yield of ATP per glucose molecule during muscle activity?

Accepted Answer

Aerobic respiration

Question 12

What is the main function of intercalated discs in cardiac muscle cells?

Accepted Answer

To join cells and allow rapid transmission of electrical impulses

Question 13

Which of the following best describes the arrangement of myofilaments in a sarcomere?

Accepted Answer

Thick filaments are composed of myosin; thin filaments are composed of actin.

Question 14

A muscle exhibits smooth, sustained contractions with no evidence of relaxation. What is this state called?

Accepted Answer

Fused (complete) tetanus

Question 15

Which of the following is a result of aerobic (endurance) exercise?

Accepted Answer

Muscles become stronger, more flexible, and resistant to fatigue.

Question 16

Which event at the neuromuscular junction directly triggers the opening of sodium channels in the sarcolemma?

Accepted Answer

Binding of acetylcholine to receptors on the sarcolemma

Question 17

Which muscle type is primarily responsible for generating heat in the body?

Accepted Answer

Skeletal muscle

Question 18

Which of the following best describes muscle tone?

Accepted Answer

A state of continuous partial contractions that keeps muscles firm and ready for action.

Question 19

Which of the following is true regarding the role of ATP in muscle contraction?

Accepted Answer

ATP provides energy for myosin heads to pivot and detach during the sliding filament process.

Question 20

Which of the following best explains why muscle force increases with stronger stimuli?

Accepted Answer

Stronger stimuli recruit more muscle fibers, resulting in greater muscle tension.

Chapter 6 - The Muscular System Part 1

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드