Question 1

Which of the following best describes the relationship between origin and insertion during muscle contraction?

Accepted Answer

The insertion moves toward the origin.

Question 2

Which muscle arrangement is characterized by fascicles converging toward a single tendon insertion, as seen in the pectoralis major?

Accepted Answer

Convergent

Question 3

During aerobic exercise, which physiological change is LEAST likely to occur in skeletal muscle?

Accepted Answer

Increase in muscle fiber size (hypertrophy)

Question 4

A muscle that opposes or reverses the action of a prime mover is called a(n):

Accepted Answer

Antagonist

Question 5

Which of the following is TRUE regarding smooth muscle tissue?

Accepted Answer

It is innervated by the autonomic nervous system.

Question 6

Which lever system in the human body is exemplified by standing on tip-toe, where the ball of the foot acts as the fulcrum?

Accepted Answer

Second-class lever

Question 7

If the effort is applied closer to the fulcrum than the load, the lever operates at:

Accepted Answer

Mechanical disadvantage

Question 8

Which muscle is the prime mover for jaw closure?

Accepted Answer

Temporalis

Question 9

Which muscle group is responsible for extension of the thigh and flexion of the knee?

Accepted Answer

Hamstrings

Question 10

Which of the following muscles is NOT part of the rotator cuff?

Accepted Answer

Deltoid

Question 11

Which muscle is primarily responsible for flexion and supination of the forearm?

Accepted Answer

Biceps brachii

Question 12

Which of the following is a function of the pelvic diaphragm?

Accepted Answer

Seals the inferior outlet of the pelvis

Question 13

Which muscle arrangement allows for the greatest range of motion but the least power?

Accepted Answer

Parallel

Question 14

Which equation best represents the force generated by a muscle based on cross-bridge attachment?

Accepted Answer

$$ F = n 	imes f_{cb} $$

Question 15

Which muscle is involved in forced expiration by decreasing the size of the rib cage?

Accepted Answer

Internal intercostals

Question 16

Which of the following muscles is responsible for smiling?

Accepted Answer

Zygomaticus major

Question 17

Which muscle group is primarily responsible for adduction of the thigh?

Accepted Answer

Adductor group

Question 18

Which of the following statements about muscle lever systems is correct?

Accepted Answer

A first-class lever can operate at either mechanical advantage or disadvantage depending on fulcrum location.

Question 19

Which muscle is the prime mover for arm abduction?

Accepted Answer

Deltoid

Question 20

Which of the following is a characteristic of single-unit smooth muscle?

Accepted Answer

Contractions are slow and synchronized.

The Muscle System: Structure, Function, and Major Muscles

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