Question 1

Which muscle fascicle arrangement is best suited for producing the greatest range of motion, and which muscle is a classic example of this arrangement?

Accepted Answer

Parallel; sartorius

Question 2

A patient is unable to flex their forearm at the elbow after an injury. Which muscle is most likely damaged?

Accepted Answer

Biceps brachii

Question 3

Which muscle is primarily responsible for abduction of the arm at the shoulder joint?

Accepted Answer

Deltoid

Question 4

A person is unable to pucker their lips. Which muscle is most likely paralyzed?

Accepted Answer

Orbicularis oris

Question 5

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

Accepted Answer

Teres major

Question 6

During a sit-up, which muscle is primarily responsible for flexing the vertebral column?

Accepted Answer

Rectus abdominis

Question 7

Which muscle is responsible for dorsiflexion of the foot at the ankle joint?

Accepted Answer

Tibialis anterior

Question 8

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

Accepted Answer

Levator scapulae

Question 9

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

Accepted Answer

Quadriceps femoris

Question 10

A soccer player suffers a groin injury. Which muscle is most likely strained?

Accepted Answer

Gracilis

Question 11

Which muscle is the primary agonist for plantar flexion at the ankle during standing calf raises?

Accepted Answer

Gastrocnemius

Question 12

Which of the following best describes the function of the transversus abdominis muscle?

Accepted Answer

Compresses the abdominal contents

Question 13

A patient cannot extend their fingers at the metacarpophalangeal joints. Which muscle is most likely impaired?

Accepted Answer

Extensor digitorum

Question 14

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

Accepted Answer

Sartorius

Question 15

Which muscle is most important for chewing and elevating the mandible?

Accepted Answer

Masseter

Question 16

A patient has difficulty turning their head to the left. Which muscle on the right side is most likely weak?

Accepted Answer

Sternocleidomastoid

Question 17

Which muscle is responsible for protracting the scapula, as in pushing against a wall?

Accepted Answer

Serratus anterior

Question 18

Which of the following muscles inserts on the calcaneus via the Achilles tendon?

Accepted Answer

Gastrocnemius

Question 19

A patient is unable to adduct their thigh. Which muscle is most likely affected?

Accepted Answer

Adductor longus

Question 20

Which muscle is responsible for flexing the wrist and is commonly used as a landmark for finding the median nerve?

Accepted Answer

Palmaris longus

Muscles of the Human Body: Structure, Arrangement, and Function

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