$$\text{Creatine phosphate} + \text{ADP} \rightarrow \text{creatine} + \text{ATP}$$

Question 1

Which of the following best describes the relationship between a motor unit and muscle fibers?

Accepted Answer

A motor unit consists of a motor neuron and all the muscle fibers it innervates.

Question 2

During a muscle twitch, which phase is characterized by no visible muscle tension and involves excitation-contraction coupling?

Accepted Answer

Latent period

Question 3

Which type of muscle contraction occurs when the muscle generates tension but does not change length?

Accepted Answer

Isometric contraction

Question 4

What is the primary function of wave (temporal) summation in muscle contraction?

Accepted Answer

To generate smooth, continuous contractions that add up

Question 5

Which of the following is TRUE regarding recruitment (multiple motor unit summation)?

Accepted Answer

Recruitment increases the force of contraction by activating more muscle fibers.

Question 6

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

Accepted Answer

$$	ext{Creatine phosphate} + 	ext{ADP} ightarrow 	ext{creatine} + 	ext{ATP}$$

Question 7

Which muscle fiber type is best suited for endurance activities such as running a marathon?

Accepted Answer

Slow oxidative fibers

Question 8

A muscle is stretched to 150% of its resting length. What happens to the force it can generate?

Accepted Answer

Force decreases because filaments do not overlap enough.

Question 9

Which of the following is a cause of muscle fatigue during prolonged exercise?

Accepted Answer

Decrease in glycogen stores

Question 10

Which pathway produces the most ATP during light-to-moderate exercise?

Accepted Answer

Aerobic respiration

Question 11

During resistance exercise, muscle hypertrophy is primarily due to:

Accepted Answer

Increase in fiber size

Question 12

Which of the following best explains why eccentric contractions are often more forceful than concentric contractions?

Accepted Answer

Eccentric contractions involve muscle lengthening while generating force.

Question 13

Which factor does NOT increase the force of skeletal muscle contraction?

Accepted Answer

Sarcomere length less than 80% of resting length

Question 14

Which of the following statements about muscle tone is correct?

Accepted Answer

Muscle tone keeps muscles firm, healthy, and ready to respond.

Question 15

If a muscle is stimulated at a frequency that does not allow complete relaxation between stimuli, what is the resulting contraction called?

Accepted Answer

Unfused (incomplete) tetanus

Question 16

Which of the following is TRUE regarding the duration and velocity of muscle contraction?

Accepted Answer

Muscles contract fastest when the load is light and more motor units are recruited.

Question 17

Which of the following is a real-life example of an isometric contraction?

Accepted Answer

Trying to lift a piano by yourself

Question 18

Which of the following best describes the anaerobic threshold?

Accepted Answer

The point at which muscle metabolism converts to anaerobic pathway

Question 19

Which of the following must occur for a muscle to return to its pre-exercise state?

Accepted Answer

Lactic acid is reconverted to pyruvic acid

Question 20

Which of the following is a plausible explanation for muscle fatigue during intense exercise?

Accepted Answer

Ionic imbalances involving K$$^+$$, Na$$^+$$, and Ca$$^{2+}$$

Muscle Contraction and Muscle Tissue: Structure, Function, and Adaptation

스터디 가이드 - 연습 문제