Question 1

Which muscle acts as the agonist during elbow flexion when lifting a glass, and what is its primary action?

Accepted Answer

Biceps brachii; flexes the forearm

Question 2

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

Accepted Answer

Supraspinatus

Question 3

Which fascicle arrangement allows for the greatest range of motion but the least force production?

Accepted Answer

Parallel

Question 4

The sternocleidomastoid muscle is named based on which criteria?

Accepted Answer

Attachment points

Question 5

Which muscle is responsible for compressing the cheeks, as in blowing a trumpet?

Accepted Answer

Buccinator

Question 6

During a forceful exhalation, which muscle is primarily responsible for depressing the ribs?

Accepted Answer

Internal intercostals

Question 7

A muscle that assists the agonist in performing its action is called a:

Accepted Answer

Synergist

Question 8

Which of the following muscles is a part of the quadriceps group and also flexes the thigh at the hip?

Accepted Answer

Rectus femoris

Question 9

If the flexor digitorum superficialis contracts, what is the antagonist muscle group?

Accepted Answer

Extensor digitorum

Question 10

Which muscle is primarily responsible for plantarflexion of the foot and also flexes the leg at the knee?

Accepted Answer

Gastrocnemius

Question 11

A patient presents with difficulty elevating their scapula. Which muscle is most likely affected?

Accepted Answer

Levator scapulae

Question 12

Which muscle is the primary flexor of the forearm and lies deep to the biceps brachii?

Accepted Answer

Brachialis

Question 13

Which muscle group is responsible for extending the vertebral column and maintaining posture?

Accepted Answer

Erector spinae

Question 14

Which muscle is responsible for closing the eyelids and is important for eye protection?

Accepted Answer

Orbicularis oculi

Question 15

A muscle with fibers converging toward a single tendon, such as the pectoralis major, is described as having which fascicle arrangement?

Accepted Answer

Convergent

Question 16

Which muscle is responsible for flexing, abducting, and laterally rotating the thigh, as well as flexing the leg at the knee?

Accepted Answer

Sartorius

Question 17

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

Accepted Answer

Teres major

Question 18

Which muscle is the primary mover for inhalation, forming the floor of the thoracic cavity?

Accepted Answer

Diaphragm

Question 19

A muscle named 'flexor carpi ulnaris' tells you all of the following EXCEPT:

Accepted Answer

It extends the fingers

Question 20

Which muscle is responsible for dorsiflexion and inversion of the foot?

Accepted Answer

Tibialis anterior

Study Guide: The Muscular System (BIO-168)

Study Guide - Practice Questions