Question 1

Which muscle is primarily responsible for flexion of the forearm at the elbow joint?

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 is the primary antagonist to the biceps brachii during elbow flexion?

Accepted Answer

Triceps brachii

Question 4

A soccer player suffers a tear in the muscle responsible for knee extension. Which muscle is most likely injured?

Accepted Answer

Rectus femoris

Question 5

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

Accepted Answer

Teres major

Question 6

A patient presents with difficulty in dorsiflexing the foot. Which muscle is most likely affected?

Accepted Answer

Tibialis anterior

Question 7

Which muscle is responsible for the action of smiling by elevating the corners of the mouth?

Accepted Answer

Zygomaticus major

Question 8

During a push-up, which muscle acts as the primary agonist for shoulder flexion?

Accepted Answer

Pectoralis major

Question 9

Which muscle is primarily responsible for plantar flexion at the ankle joint?

Accepted Answer

Gastrocnemius

Question 10

A patient is unable to rotate their head to the left or right. Which muscle is most likely affected?

Accepted Answer

Sternocleidomastoid

Question 11

Which muscle is responsible for compressing the cheeks during blowing or sucking?

Accepted Answer

Buccinator

Question 12

A patient with carpal tunnel syndrome is experiencing numbness in the hand. Which anatomical structure is directly involved in this condition?

Accepted Answer

Flexor retinaculum

Question 13

Which muscle is the primary flexor of the thigh at the hip joint?

Accepted Answer

Iliopsoas

Question 14

Which muscle is responsible for the action of closing the eyelids?

Accepted Answer

Orbicularis oculi

Question 15

A patient is unable to extend their leg at the knee joint. Which muscle group is most likely impaired?

Accepted Answer

Quadriceps femoris

Question 16

Which muscle is responsible for the action of elevating the scapula, such as when shrugging the shoulders?

Accepted Answer

Trapezius

Question 17

During a jumping motion, which muscle is primarily responsible for extending the hip joint?

Accepted Answer

Gluteus maximus

Question 18

Which muscle is responsible for flexion and lateral rotation of the thigh, as in crossing one leg over the other?

Accepted Answer

Sartorius

Question 19

A patient is unable to retract their scapula. Which muscle is most likely impaired?

Accepted Answer

Rhomboid major

Question 20

Which muscle is responsible for the action of puckering the lips, as in whistling?

Accepted Answer

Orbicularis oris

Identification and Function of Human Muscles: Anatomy & Physiology I Study Guide

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