Question 1

Which of the following best describes the role of the sarcoplasmic reticulum in skeletal muscle contraction?

Accepted Answer

It stores and releases calcium ions ($$\mathrm{Ca$$^{2+}$$}) $$necessary for muscle contraction.

Question 2

During the sliding filament theory of muscle contraction, what happens to the H zone and I band as the muscle contracts?

Accepted Answer

The H zone disappears and the I band narrows.

Question 3

Which connective tissue layer directly surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 4

A patient has a mutation that prevents the formation of functional troponin. Which of the following would most likely occur?

Accepted Answer

Tropomyosin would not move away from actin's binding sites, preventing contraction.

Question 5

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

Accepted Answer

Presence of intercalated discs

Question 6

Which of the following best describes the function of T-tubules in skeletal muscle fibers?

Accepted Answer

They carry action potentials from the sarcolemma into the cell interior.

Question 7

Which muscle type is responsible for involuntary movement of food through the digestive tract?

Accepted Answer

Smooth muscle

Question 8

In a third-class lever system, such as the biceps brachii flexing the forearm, which of the following is the correct order from proximal to distal?

Accepted Answer

Fulcrum, effort, resistance

Question 9

Which of the following statements about the sarcomere is correct?

Accepted Answer

The Z line anchors the thin filaments.

Question 10

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

Accepted Answer

Synergist

Question 11

Which of the following best describes the sequence of events at the neuromuscular junction leading to muscle contraction?

Accepted Answer

Action potential arrives, acetylcholine is released, binds to receptors, muscle fiber depolarizes

Question 12

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

Accepted Answer

Parallel

Question 13

Which protein directly binds calcium ions to initiate skeletal muscle contraction?

Accepted Answer

Troponin

Question 14

Which of the following is true regarding the origin and insertion of a skeletal muscle?

Accepted Answer

The insertion moves toward the origin during contraction.

Question 15

A muscle with fascicles that attach obliquely to a central tendon is classified as:

Accepted Answer

Pennate

Question 16

Which of the following best explains why skeletal muscle fibers have multiple peripheral nuclei?

Accepted Answer

They are formed by the fusion of multiple myoblasts during development.

Question 17

Which of the following is a function of skeletal muscle that is critical for homeostasis?

Accepted Answer

Generating body heat to maintain temperature

Question 18

If a toxin blocks acetylcholine receptors at the neuromuscular junction, what is the most likely result?

Accepted Answer

Muscle paralysis due to failure of depolarization

Question 19

Which of the following statements about muscle contraction is correct?

Accepted Answer

The A band remains the same length during contraction.

Question 20

Which of the following best describes the function of tropomyosin in skeletal muscle contraction?

Accepted Answer

It covers myosin binding sites on actin when the muscle is relaxed.

Chapter 9: Myology – The Muscular System and Skeletal Muscle Tissue

Study Guide - Practice Questions