Question 1

Which of the following best describes the role of the epimysium in skeletal muscle organization?

Accepted Answer

It surrounds the entire muscle, separating it from surrounding tissues and connecting to deep fascia.

Question 2

During skeletal muscle contraction, which of the following changes occur according to the sliding-filament theory?

Accepted Answer

The H bands and I bands narrow, and Z lines move closer together.

Question 3

Which structure is responsible for transmitting the action potential from the motor neuron to the skeletal muscle fiber?

Accepted Answer

Neuromuscular junction

Question 4

A patient suffers a traumatic injury that damages the perimysium of a muscle. Which of the following is most likely to be affected?

Accepted Answer

The delivery of oxygen and nutrients to muscle fascicles

Question 5

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

Accepted Answer

Presence of intercalated discs for electrical continuity

Question 6

Which of the following best explains why smooth muscle can contract even when stretched?

Accepted Answer

Smooth muscle cells lack sarcomeres, so tension and resting length are not directly related.

Question 7

Which of the following events occurs first during excitation–contraction coupling in skeletal muscle?

Accepted Answer

Binding of acetylcholine to chemically gated Na$$^+$$ channels on the muscle fiber

Question 8

Which connective tissue layer contains myosatellite cells that are important for muscle repair?

Accepted Answer

Endomysium

Question 9

A muscle fiber is observed to have striations, a single central nucleus, and intercalated discs. Which type of muscle is this?

Accepted Answer

Cardiac muscle

Question 10

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

Accepted Answer

It marks the boundaries between adjacent sarcomeres.

Question 11

Which of the following is a function of skeletal muscle that is NOT shared by cardiac or smooth muscle?

Accepted Answer

Maintaining posture and body position

Question 12

Which of the following statements about the sliding-filament theory is correct?

Accepted Answer

Thin filaments slide toward the center of the sarcomere, causing the sarcomere to shorten.

Question 13

Which of the following best explains why skeletal muscle fibers are multinucleate?

Accepted Answer

They develop by the fusion of embryonic myoblasts.

Question 14

Which of the following is true regarding the control of smooth muscle contraction?

Accepted Answer

Visceral smooth muscle cells contract in rhythmic cycles controlled by pacesetter cells.

Question 15

Which of the following is the correct sequence of events in skeletal muscle contraction, starting from neural stimulation?

Accepted Answer

Neural control → Excitation → Release of calcium ions → Contraction cycle begins → Sarcomere shortening → Generation of muscle tension

Question 16

A drug blocks the release of acetylcholine (ACh) at the neuromuscular junction. What is the most immediate effect on skeletal muscle?

Accepted Answer

The muscle will not be able to contract in response to neural stimulation.

Question 17

Which of the following best describes the function of myosatellite cells in skeletal muscle?

Accepted Answer

They repair damaged muscle fibers.

Question 18

Which of the following is a property shared by all muscle tissue types?

Accepted Answer

Excitability, contractility, extensibility, and elasticity

Question 19

Which of the following best explains why the diaphragm is considered a skeletal muscle but often works subconsciously?

Accepted Answer

It is under voluntary control but is regulated automatically for breathing.

Question 20

Which of the following is a correct statement about the difference between skeletal, cardiac, and smooth muscle fibers?

Accepted Answer

Only cardiac muscle fibers have intercalated discs and are striated.

Lecture 4.2: Muscle Tissue - Structure, Function, and Types

Study Guide - Practice Questions