Q: Which of the following equations correctly represents the breakdown of ATP during muscle contraction?

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

Question 1

Which of the following best describes the sliding filament theory of muscle contraction?

Accepted Answer

Myosin heads bind to actin, pulling the actin filaments toward the center of the sarcomere, resulting in muscle shortening.

Question 2

A patient is unable to perform plantar flexion after an injury. Which muscle action is most likely impaired?

Accepted Answer

Pointing the toes downward

Question 3

Which of the following is the primary energy source for muscle contraction during the first few seconds of intense activity?

Accepted Answer

Creatine phosphate (phosphagen) system

Question 4

A muscle that assists the prime mover in performing an action is called a:

Accepted Answer

Synergist

Question 5

Which of the following best describes a bipennate muscle arrangement?

Accepted Answer

Fascicles are arranged on both sides of a central tendon.

Question 6

During a biceps curl, which muscle acts as the agonist?

Accepted Answer

Biceps brachii

Question 7

Which of the following statements about muscle fatigue is correct?

Accepted Answer

Muscle fatigue can result from accumulation of lactic acid and depletion of energy reserves.

Question 8

A muscle that opposes the action of the prime mover is called the:

Accepted Answer

Antagonist

Question 9

Which of the following muscle fiber types is most resistant to fatigue and is best suited for endurance activities?

Accepted Answer

Type I (slow oxidative)

Question 10

Which of the following best describes the difference between hypertrophy and atrophy?

Accepted Answer

Hypertrophy is an increase in muscle size due to increased use; atrophy is a decrease in muscle size due to disuse.

Question 11

Which of the following correctly matches the muscle term with its definition?

Accepted Answer

Agonist: the muscle primarily responsible for a movement

Question 12

A patient presents with difficulty performing supination of the forearm. Which movement is most likely affected?

Accepted Answer

Turning the palm upward

Question 13

Which of the following is true regarding isometric muscle contractions?

Accepted Answer

The muscle does not change length, but tension increases.

Question 14

Which of the following best describes the function of the Z line in a sarcomere?

Accepted Answer

It marks the boundary between adjacent sarcomeres.

Question 15

A soccer player experiences muscle soreness after a game. Which physiological property of muscle is most directly related to this phenomenon?

Accepted Answer

Fatigue

Question 16

Which of the following equations correctly represents the breakdown of ATP during muscle contraction?

Accepted Answer

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

Question 17

Which of the following muscle arrangements allows for the greatest range of motion but the least power?

Accepted Answer

Parallel

Question 18

During anaerobic respiration in muscle cells, which byproduct accumulates and contributes to muscle fatigue?

Accepted Answer

Lactic acid

Question 19

A weightlifter is performing a biceps curl and holds the weight stationary at a 90-degree angle for 10 seconds. What type of muscle contraction is occurring?

Accepted Answer

Isometric

Question 20

Which of the following best describes the difference between concentric and eccentric muscle contractions?

Accepted Answer

Concentric contractions shorten the muscle; eccentric contractions lengthen the muscle while generating force.

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