Question 1

Which of the following best describes the function of a muscle's origin?

Accepted Answer

It is the site of attachment of the fixed end of a muscle, typically more proximal.

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 of the following is an example of a third-class lever in the human body?

Accepted Answer

Flexing the forearm at the elbow using the biceps brachii

Question 4

Which muscle is primarily responsible for flexion and supination of the forearm and also stabilizes the shoulder joint?

Accepted Answer

Biceps brachii

Question 5

A patient presents with wrist drop and difficulty extending their fingers. Which muscle group is most likely affected?

Accepted Answer

Extensor carpi muscles

Question 6

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

Accepted Answer

Flexes the neck, drawing the head forward

Question 7

Which muscle is most likely to be involved in a 'pulled hamstring' injury?

Accepted Answer

Biceps femoris

Question 8

A patient is diagnosed with carpal tunnel syndrome. Which structure is most likely being compressed?

Accepted Answer

Median nerve

Question 9

Which of the following muscles is NOT part of the rotator cuff (SITS) group?

Accepted Answer

Teres major

Question 10

Which fascicular arrangement allows for the greatest range of motion but the least power?

Accepted Answer

Parallel

Question 11

A muscle named 'flexor carpi radialis' is most likely to:

Accepted Answer

Flex the wrist on the radial side

Question 12

Which muscle is the primary agonist for plantar flexion at the ankle during activities such as jumping?

Accepted Answer

Gastrocnemius

Question 13

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

Accepted Answer

Internal intercostals

Question 14

Which muscle is most important for initiating abduction of the arm at the shoulder joint?

Accepted Answer

Supraspinatus

Question 15

A patient is unable to dorsiflex their foot after a leg injury. Which muscle is most likely affected?

Accepted Answer

Tibialis anterior

Question 16

Which of the following best describes the action of the buccinator muscle?

Accepted Answer

Compresses the cheek, as in blowing or sucking

Question 17

Which muscle is primarily responsible for flexion at the knee and extension at the hip?

Accepted Answer

Biceps femoris

Question 18

Which of the following is a correct statement about muscle naming conventions?

Accepted Answer

The term 'deltoid' refers to a triangular-shaped muscle.

Question 19

A patient is unable to rotate their forearm so that the palm faces anteriorly. Which muscle is most likely impaired?

Accepted Answer

Supinator

Question 20

Which of the following best explains why pennate muscles can generate more power than parallel muscles of the same size?

Accepted Answer

Pennate muscles have more muscle fibers packed into a given area, increasing cross-sectional area.

Muscular System: Structure, Function, and Body Movements

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