ACSM-EP Anatomy & Physiology 2

Question 1

Which muscle fiber type has the highest oxidative capacity and is most resistant to fatigue?

Accepted Answer

Type I

Answer

Type I (slow-twitch) fibers have the highest mitochondrial density and oxidative enzyme activity, making them highly fatigue-resistant.

Question 2

The brachialis muscle inserts on which bone?

Accepted Answer

Coronoid process of ulna

Answer

The brachialis inserts on the coronoid process and tuberosity of the ulna, making it the primary elbow flexor.

Question 3

During maximal exercise, cardiac output increases primarily due to which factor?

Accepted Answer

Combined increases in heart rate and stroke volume

Answer

Cardiac output rises during maximal exercise through simultaneous increases in both heart rate and stroke volume.

Question 4

Which structure in the heart initiates the electrical impulse for each heartbeat?

Accepted Answer

Sinoatrial node

Answer

The sinoatrial (SA) node is the heart's natural pacemaker, spontaneously generating electrical impulses at the highest intrinsic rate.

Question 5

Which joint action occurs at the hip during the concentric phase of a squat ascent?

Accepted Answer

Extension

Answer

During squat ascent, the hip moves from a flexed to a more extended position, which is hip extension.

ACSM Practice Test