Question 1

Which of the following statements best describes the difference between skeletal and smooth muscle tissue?

Accepted Answer

Skeletal muscle is voluntary and striated, while smooth muscle is involuntary and lacks striations.

Question 2

A patient is unable to consciously flex their arm at the elbow. Which type of muscle tissue is most likely affected?

Accepted Answer

Skeletal muscle

Question 3

Which connective tissue layer directly surrounds a single muscle fiber?

Accepted Answer

Endomysium

Question 4

During muscle contraction, which ion is released from the sarcoplasmic reticulum to trigger the exposure of myosin-binding sites on actin?

Accepted Answer

Calcium (Ca²⁺)

Question 5

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

Accepted Answer

Myosin heads bind to actin, pivot, and pull thin filaments toward the center of the sarcomere.

Question 6

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

Accepted Answer

Aerobic respiration

Question 7

A marathon runner relies primarily on which pathway for ATP production during a race?

Accepted Answer

Aerobic respiration

Question 8

Which of the following is a function of skeletal muscle?

Accepted Answer

Maintaining posture

Question 9

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

Accepted Answer

It breaks down acetylcholine, ending muscle contraction.

Question 10

Which of the following best describes the movement known as abduction?

Accepted Answer

Moving a limb away from the midline of the body

Question 11

A soccer player points their toes downward to kick a ball. Which special movement is this?

Accepted Answer

Plantar flexion

Question 12

Which of the following is true regarding the regulation of cardiac muscle contraction?

Accepted Answer

It is involuntary and can be influenced by hormones and the nervous system.

Question 13

Which of the following best describes the function of the sarcoplasmic reticulum in skeletal muscle fibers?

Accepted Answer

It stores and releases calcium ions necessary for muscle contraction.

Question 14

Which of the following scenarios best illustrates the concept of muscle fatigue?

Accepted Answer

A runner experiences a decrease in muscle force after prolonged sprinting due to lactic acid accumulation.

Question 15

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

Accepted Answer

Action potential → Ca²⁺ influx → ACh release → Na⁺ influx → muscle contraction

Question 16

Which of the following best describes the anatomical arrangement of a sarcomere?

Accepted Answer

It extends from one Z disc to the next Z disc.

Question 17

Which of the following movements is an example of circumduction?

Accepted Answer

Moving the arm in a circular motion at the shoulder

Question 18

Which of the following is a characteristic unique to cardiac muscle tissue?

Accepted Answer

Branching cells joined by intercalated discs

Question 19

Which of the following best explains why tendons are able to withstand tension and transmit force from muscle to bone?

Accepted Answer

They are composed mostly of collagen fibers, which are tough and strong.

Question 20

A person rotates their forearm so that the palm faces upward. Which movement is this?

Accepted Answer

Supination

The Muscular System: Structure, Function, and Mechanisms

Study Guide - Practice Questions