Question 1

Which of the following best describes an isometric muscle contraction?

Accepted Answer

The muscle generates tension without changing length.

Question 2

A motor unit consists of:

Accepted Answer

One motor neuron and all the muscle fibers it innervates.

Question 3

During a muscle twitch, which phase immediately follows the latent period?

Accepted Answer

Contraction phase

Question 4

Which equation correctly represents the direct phosphorylation of ADP by creatine phosphate?

Accepted Answer

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

Question 5

Which of the following is TRUE regarding graded muscle responses?

Accepted Answer

They are produced by changing the frequency and strength of stimulation.

Question 6

A patient is unable to lift a heavy box, but their muscles are visibly contracting without movement. What type of contraction is occurring?

Accepted Answer

Isometric contraction

Question 7

Which process is responsible for regenerating ATP during short, intense exercise lasting only a few seconds?

Accepted Answer

Direct phosphorylation by creatine phosphate

Question 8

If a muscle is stimulated at a high frequency such that no relaxation occurs between stimuli, what is this phenomenon called?

Accepted Answer

Complete tetanus

Question 9

Which of the following is NOT a fuel used in aerobic respiration during muscle contraction?

Accepted Answer

Creatine phosphate

Question 10

Muscle fatigue is most likely caused by:

Accepted Answer

Disturbances in homeostasis and accumulation of metabolic byproducts.

Question 11

Which of the following best explains why smaller motor units allow for finer muscle control?

Accepted Answer

They have fewer muscle fibers per motor neuron, allowing precise movements.

Question 12

During anaerobic glycolysis, what is the primary product formed when oxygen is limited?

Accepted Answer

Lactic acid

Question 13

Which of the following is a correct statement about recruitment in muscle contraction?

Accepted Answer

Recruitment increases the force of contraction by activating more motor units.

Question 14

Which equation best represents aerobic respiration in muscle cells?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + 36\mathrm{ATP}$$

Question 15

After intense exercise, which process helps restore muscle cells to their pre-exercise state?

Accepted Answer

Excess postexercise oxygen consumption (EPOC)

Question 16

Which of the following is TRUE about isotonic contractions?

Accepted Answer

The muscle changes length while moving a load.

Question 17

Which of the following is a consequence of reaching the anaerobic threshold during exercise?

Accepted Answer

ATP production becomes less efficient and lactic acid accumulates.

Question 18

A sprinter uses which primary energy system during a 10-second dash?

Accepted Answer

Direct phosphorylation by creatine phosphate

Question 19

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

Accepted Answer

Concentric contractions shorten the muscle, eccentric contractions lengthen it.

Question 20

Which of the following is NOT a mechanism for rapid ATP regeneration in muscle fibers?

Accepted Answer

Oxidative phosphorylation in the cytoplasm

Muscle and Muscle Tissue Physiology: Study Notes

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