Question 1

Which of the following best describes the function of the neurotransmitter acetylcholine at the neuromuscular junction?

Accepted Answer

It initiates muscle contraction by triggering an action potential in the muscle fiber.

Question 2

A patient is exposed to botulinum toxin (Botox). Which step in the neuromuscular junction is most directly affected?

Accepted Answer

Release of acetylcholine from the motor neuron.

Question 3

Which muscle characteristic allows a muscle to return to its original shape after being stretched?

Accepted Answer

Elasticity

Question 4

During the cross bridge cycle, what is the immediate result of calcium binding to troponin?

Accepted Answer

Tropomyosin shifts, exposing binding sites on actin.

Question 5

Which equation best represents the relationship between force ($$F$$), muscle cross-sectional area ($$A$$), and muscle tension ($$T$$)?

Accepted Answer

$$F = T 	imes A$$

Question 6

A muscle fiber is unable to relax after death, resulting in rigor mortis. Which of the following best explains this phenomenon?

Accepted Answer

ATP is unavailable, preventing detachment of myosin from actin.

Question 7

Which connective tissue sheath surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 8

A muscle that assists the agonist in performing a movement is called a:

Accepted Answer

Synergist

Question 9

Which of the following is true regarding skeletal muscle fibers?

Accepted Answer

They are voluntary and striated.

Question 10

If the action potential threshold is not reached in a muscle fiber, what is the most likely outcome?

Accepted Answer

The muscle fiber will remain at rest.

Question 11

Which muscle is primarily responsible for flexing the forearm at the elbow?

Accepted Answer

Biceps brachii

Question 12

Which of the following best describes the role of the diaphragm in breathing?

Accepted Answer

It contracts to increase thoracic volume, causing inhalation.

Question 13

Which muscle group is responsible for extending the knee?

Accepted Answer

Quadriceps

Question 14

What is the primary function of myoglobin in muscle fibers?

Accepted Answer

Stores oxygen for aerobic metabolism.

Question 15

Which of the following muscles is involved in forced inspiration?

Accepted Answer

Scalenes

Question 16

A muscle's origin is best defined as:

Accepted Answer

The fixed or less movable attachment of the muscle.

Question 17

Which of the following is a function of the orbicularis oris muscle?

Accepted Answer

Closes and protrudes the lips

Question 18

Which statement best explains why muscles need antagonists?

Accepted Answer

To allow movement in the opposite direction.

Question 19

Which of the following is true about the sliding filament theory?

Accepted Answer

Actin and myosin filaments slide past each other, causing sarcomere shortening.

Question 20

A muscle named 'rectus femoris' is named based on which two criteria?

Accepted Answer

Location and fiber direction

Muscle Tissue and Muscular System: Study Guide

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