Question 1

Which of the following best describes the primary source of energy for skeletal muscle contraction?

Accepted Answer

ATP generated by mitochondria

Question 2

Which structure in a sarcomere shortens during muscle contraction?

Accepted Answer

I band

Question 3

A patient presents with muscle weakness and rapid fatigue. Which condition is most likely responsible?

Accepted Answer

Myasthenia Gravis

Question 4

Which muscle acts as the primary fixator during elbow flexion?

Accepted Answer

Brachialis

Question 5

Which of the following muscles is classified as an intrinsic muscle of the hand?

Accepted Answer

Lumbricals

Question 6

During respiration, which muscle is primarily responsible for increasing the volume of the thoracic cavity?

Accepted Answer

Diaphragm

Question 7

Which of the following best describes the action of the gluteus maximus muscle?

Accepted Answer

Extension of the hip

Question 8

If a patient has damage to the median nerve, which muscle function would most likely be impaired?

Accepted Answer

Opposition of the thumb by opponens pollicis

Question 9

Which muscle is responsible for adduction of the thigh and is listed in Table 12.6 of the textbook?

Accepted Answer

Adductor longus

Question 10

Which of the following is the correct order of abdominal wall muscles from superficial to deep?

Accepted Answer

External oblique, internal oblique, transversus abdominis

Question 11

Which equation correctly represents the force generated by a muscle according to the sliding filament theory?

Accepted Answer

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

Question 12

A soccer player suffers a pulled hamstring. Which muscle group is most likely affected?

Accepted Answer

Hamstrings (biceps femoris, semitendinosus, semimembranosus)

Question 13

Which muscle is the largest in the human body?

Accepted Answer

Gluteus maximus

Question 14

Which muscle is responsible for the abduction of the arm at the shoulder joint?

Accepted Answer

Deltoid

Question 15

Which of the following muscles is innervated by the facial nerve (cranial nerve VII)?

Accepted Answer

Orbicularis oculi

Question 16

Which muscle is the primary antagonist during forearm flexion?

Accepted Answer

Triceps brachii

Question 17

Which of the following best describes the function of tendinous intersections in the rectus abdominis?

Accepted Answer

They segment the muscle, giving the 'six-pack' appearance

Question 18

Which muscle is responsible for plantar flexion of the foot?

Accepted Answer

Gastrocnemius

Question 19

A patient is unable to extend their wrist and fingers. Which nerve is most likely damaged?

Accepted Answer

Radial nerve

Question 20

Which muscle is responsible for the rotation of the trunk and is part of the superficial group of the abdominal wall?

Accepted Answer

External oblique

Anatomy & Physiology: Muscular System Study Guide

Study Guide - Practice Questions