Question 1

Which connective tissue layer directly surrounds individual skeletal muscle fibers?

Accepted Answer

Endomysium

Question 2

A muscle that is broad at one end and tapers to a single tendon is best described as which muscle shape?

Accepted Answer

Convergent

Question 3

Which of the following best describes the function of a fixator muscle during movement?

Accepted Answer

It holds a bone in place to make movement more efficient.

Question 4

Which lever system is most common in the human body and is exemplified by the action of the biceps brachii at the elbow?

Accepted Answer

Third-class lever

Question 5

A patient presents with pain and swelling in the calf after hearing a 'pop' during a basketball game. The foot cannot plantarflex when the gastrocnemius is squeezed. What is the most likely diagnosis?

Accepted Answer

Calcaneal tendon rupture

Question 6

Which muscle is the primary agonist for flexion of the forearm at the elbow joint?

Accepted Answer

Brachialis

Question 7

Which muscle is known as the 'boxer’s muscle' due to its role in protracting the scapula?

Accepted Answer

Serratus anterior

Question 8

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

Accepted Answer

Deltoid

Question 9

A muscle named 'flexor digitorum profundus' is likely to be:

Accepted Answer

A deep muscle that flexes the fingers

Question 10

Which muscle group is primarily responsible for extending the leg at the knee joint?

Accepted Answer

Quadriceps femoris

Question 11

Which muscle is the main agonist for arm abduction at the shoulder joint?

Accepted Answer

Deltoid (central portion)

Question 12

Which of the following best describes a second-class lever in the human body?

Accepted Answer

The load is between the fulcrum and the force

Question 13

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

Accepted Answer

Tibialis anterior

Question 14

Which muscle is the main agonist for forced expiration?

Accepted Answer

Internal intercostals

Question 15

A patient with a rotator cuff injury is most likely to have damage to which tendon?

Accepted Answer

Supraspinatus tendon

Question 16

Which muscle is responsible for elevating the mandible during mastication?

Accepted Answer

Masseter

Question 17

Which of the following is a function of the transversus abdominis muscle?

Accepted Answer

Compresses the abdominal cavity

Question 18

Which muscle is primarily responsible for protracting the mandible and producing side-to-side movements during chewing?

Accepted Answer

Lateral pterygoid

Question 19

Which muscle group is the main extensor of the vertebral column?

Accepted Answer

Erector spinae

Question 20

Which of the following best describes the action of the sternocleidomastoid muscle when both sides contract together?

Accepted Answer

Flexes the head

The Muscular System: Structure, Function, and Major Muscles

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