Question 1

Which muscle is primarily responsible for flexing the elbow and supinating the forearm?

Accepted Answer

Biceps brachii

Question 2

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

Accepted Answer

Deltoid

Question 3

Which muscle group is responsible for extending the knee?

Accepted Answer

Quadriceps femoris

Question 4

During chewing, which muscle elevates the mandible and assists in side-to-side movement?

Accepted Answer

Masseter

Question 5

Which muscle is the primary agonist for plantar flexion of the foot during standing on tiptoes?

Accepted Answer

Gastrocnemius

Question 6

A muscle with fascicles arranged in a circular pattern is best suited for which function?

Accepted Answer

Closing body openings

Question 7

Which of the following muscles is a part of the rotator cuff and assists in lateral rotation of the arm?

Accepted Answer

Infraspinatus

Question 8

If a person cannot flex their spine, which muscle is most likely weakened?

Accepted Answer

Rectus abdominis

Question 9

Which muscle originates from the iliac crest, sacrum, and coccyx, and is responsible for hip extension and lateral rotation?

Accepted Answer

Gluteus maximus

Question 10

A muscle with a bipennate fascicle arrangement is best exemplified by which of the following?

Accepted Answer

Rectus femoris

Question 11

Which muscle is responsible for closing the eyelids?

Accepted Answer

Orbicularis oculi

Question 12

Which muscle acts as an antagonist to the biceps brachii during elbow extension?

Accepted Answer

Triceps brachii

Question 13

Which muscle is primarily responsible for dorsiflexion of the foot?

Accepted Answer

Tibialis anterior

Question 14

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

Accepted Answer

Rhomboid major

Question 15

Which muscle assists in both flexion and lateral rotation of the thigh, allowing you to cross your legs?

Accepted Answer

Sartorius

Question 16

Which of the following is a function of the trapezius muscle?

Accepted Answer

Elevates and retracts the scapula

Question 17

Which muscle is responsible for compressing the abdomen and flexing the spine?

Accepted Answer

External oblique

Question 18

Which muscle is a synergist to the deltoid during arm abduction?

Accepted Answer

Supraspinatus

Question 19

Which muscle is most active when you smile and move your mouth?

Accepted Answer

Orbicularis oris

Question 20

Which muscle is responsible for extending the forearm at the elbow?

Accepted Answer

Triceps brachii

Study Guide: The Muscular System (HKIN 162 Lab 4)

Study Guide - Practice Questions