Question 1

Which of the following best describes the movement known as 'flexion' at a joint?

Accepted Answer

Flexion decreases the degree of the angle at a joint.

Question 2

A patient is unable to abduct their arm at the shoulder. Which muscle is most likely impaired?

Accepted Answer

Deltoid

Question 3

Which muscle is the primary mover for inspiration by enlarging the thoracic cavity?

Accepted Answer

Diaphragm

Question 4

During a forceful exhalation, which muscle group is primarily responsible for compressing the thoracic cavity?

Accepted Answer

Internal intercostals

Question 5

Which of the following muscles is responsible for voluntary closure of the eyelid (winking)?

Accepted Answer

Orbicularis oculi

Question 6

A patient presents with difficulty rotating and flexing their head. Which muscle is most likely affected?

Accepted Answer

Sternocleidomastoid

Question 7

Which muscle is the principal flexor of the forearm at the elbow joint?

Accepted Answer

Brachialis

Question 8

The rotator cuff muscles stabilize the shoulder joint. Which of the following is NOT a rotator cuff muscle?

Accepted Answer

Teres major

Question 9

Which muscle is the prime mover for reaching and pushing by drawing the scapula laterally and forward?

Accepted Answer

Serratus anterior

Question 10

A soccer player suffers a tear in the muscle that forms the mass of the buttock and is the prime hip extensor. Which muscle is injured?

Accepted Answer

Gluteus maximus

Question 11

Which muscle group is primarily responsible for knee extension and is considered the most powerful muscle in the body?

Accepted Answer

Quadriceps femoris

Question 12

Which muscle is the longest in the human body and is involved in both hip and knee movements?

Accepted Answer

Sartorius

Question 13

A patient is unable to plantar flex their foot. Which muscle is most likely impaired?

Accepted Answer

Gastrocnemius

Question 14

Which of the following muscles is responsible for adducting the thigh?

Accepted Answer

Adductor longus

Question 15

Which muscle is primarily responsible for elevating the mandible during chewing?

Accepted Answer

Masseter

Question 16

Which of the following best describes the action of the erector spinae muscle group?

Accepted Answer

Extends, rotates, and stabilizes the spine for upright posture

Question 17

A patient presents with difficulty abducting and medially rotating their thigh. Which muscle is most likely affected?

Accepted Answer

Gluteus medius

Question 18

Which muscle is a synergist in forearm flexion and also assists in pronation and supination when the forearm is in a mid-pronated position?

Accepted Answer

Brachioradialis

Question 19

Which of the following muscles is NOT part of the hamstring group?

Accepted Answer

Rectus femoris

Question 20

Which muscle attaches to the calcaneus via the strongest tendon in the body and is responsible for plantar flexion?

Accepted Answer

Gastrocnemius

Muscular System: Axial and Appendicular Musculature Study Guide

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