Question 1

Which of the following statements best describes the difference in the regulation of contraction between skeletal, cardiac, and smooth muscle tissue?

Accepted Answer

Smooth muscle contraction is involuntary and can be regulated by nervous system controls, hormones, and chemicals.

Question 2

A patient presents with muscle tissue that is spindle-shaped, uninucleate, and lacks striations. In which organ is this tissue most likely found?

Accepted Answer

Stomach

Question 3

Which connective tissue wrapping surrounds a single muscle fiber?

Accepted Answer

Endomysium

Question 4

During the sliding filament theory of muscle contraction, what is the role of calcium ions ($$\mathrm{Ca$$^{2+}$$}$$)?

Accepted Answer

They bind to regulatory proteins on actin, exposing myosin-binding sites.

Question 5

Which of the following best describes the appearance and structure of cardiac muscle cells?

Accepted Answer

Branching chains of cells, uninucleate, striated, with intercalated discs

Question 6

Which pathway provides the greatest net gain of ATP per glucose molecule during muscle contraction?

Accepted Answer

Aerobic respiration

Question 7

A muscle is stimulated so rapidly that no evidence of relaxation is seen and contractions are smooth and sustained. What is this state called?

Accepted Answer

Fused (complete) tetanus

Question 8

Which of the following is TRUE regarding the sarcomere?

Accepted Answer

It is the contractile unit of a muscle fiber, defined as the region between two Z discs.

Question 9

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

Accepted Answer

To store and release calcium ions ($$\mathrm{Ca$$^{2+}$$})$$

Question 10

Which of the following best explains why muscle fatigue occurs during strenuous exercise?

Accepted Answer

Accumulation of lactic acid and ion imbalances

Question 11

Which muscle type is capable of rhythmic contraction and is regulated by both the nervous system and hormones?

Accepted Answer

Cardiac muscle

Question 12

A patient is unable to voluntarily move their biceps muscle. Which type of muscle tissue is affected?

Accepted Answer

Skeletal muscle

Question 13

Which of the following is a correct sequence of events at the neuromuscular junction leading to muscle contraction?

Accepted Answer

ACh is released, sodium channels open, action potential is generated, calcium is released from the sarcoplasmic reticulum

Question 14

Which of the following best describes an isometric muscle contraction?

Accepted Answer

The muscle generates tension but does not shorten.

Question 15

Which of the following is NOT a function of skeletal muscle?

Accepted Answer

Pumping blood

Question 16

Which of the following best explains why aerobic exercise increases muscle endurance?

Accepted Answer

It enhances the muscle's ability to use oxygen efficiently for ATP production.

Question 17

Which of the following is TRUE regarding the speed of contraction among muscle types?

Accepted Answer

Skeletal muscle contraction speed ranges from slow to fast.

Question 18

Which of the following is the correct formula for the direct phosphorylation of ADP by creatine phosphate?

Accepted Answer

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

The Muscular System: Structure, Function, and Physiology

Study Guide - Practice Questions