Question 1

Which muscle is primarily responsible for closing the jaw during mastication?

Accepted Answer

Masseter

Question 2

A patient presents with difficulty abducting their arm at the shoulder. Which muscle is most likely impaired?

Accepted Answer

Deltoid

Question 3

Which of the following best describes the function of the diaphragm?

Accepted Answer

Contracts to increase thoracic volume during inspiration

Question 4

The sarcomere is defined as the region between two:

Accepted Answer

Z-disks

Question 5

Which muscle is responsible for dorsiflexion of the foot?

Accepted Answer

Tibialis anterior

Question 6

A baseball pitcher tears his rotator cuff. Which muscle is NOT part of the rotator cuff group?

Accepted Answer

Teres major

Question 7

Which of the following muscles is involved in flexing the forearm at the elbow?

Accepted Answer

Brachialis

Question 8

Which muscle is responsible for compressing the cheeks during whistling?

Accepted Answer

Buccinator

Question 9

Which muscle group is primarily responsible for extension of the knee?

Accepted Answer

Quadriceps femoris

Question 10

Which of the following is the correct formula for calculating the force generated by a muscle, given cross-sectional area ($A$) and specific tension ($T$)?

Accepted Answer

$F = A 	imes T$

Question 11

A patient is unable to flex their trunk. Which muscle is most likely affected?

Accepted Answer

Rectus abdominis

Question 12

Which muscle is responsible for elevating the scapula?

Accepted Answer

Levator scapulae

Question 13

Which of the following best describes the role of myoglobin in muscle cells?

Accepted Answer

Binds oxygen for aerobic metabolism

Question 14

Which muscle is responsible for flexing the hip joint?

Accepted Answer

Iliopsoas

Question 15

Which of the following is a correct description of the origin and insertion of the sternocleidomastoid muscle?

Accepted Answer

Origin: Sternum and clavicle; Insertion: Mastoid process

Question 16

Which muscle is responsible for plantar flexion of the foot?

Accepted Answer

Gastrocnemius

Question 17

Which of the following structures is the smallest functional unit of a muscle fiber?

Accepted Answer

Sarcomere

Question 18

A patient has difficulty extending their fingers. Which muscle is most likely affected?

Accepted Answer

Extensor digitorum

Question 19

Which muscle is responsible for lateral rotation of the thigh?

Accepted Answer

Piriformis

Question 20

Which of the following best describes the arrangement of fascicles in the rectus abdominis muscle?

Accepted Answer

Parallel

Muscle Identification, Structure, and Function: Study Guide for Anatomy & Physiology

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