Question 1

A patient presents with difficulty abducting their arm at the shoulder joint. Which muscle is most likely impaired, and what is its primary action?

Accepted Answer

Deltoid; abduction at the shoulder

Question 2

Which of the following best describes the difference between the origin and insertion of a skeletal muscle?

Accepted Answer

The origin is the fixed point of attachment, usually proximal, and the insertion is the moving point, usually distal.

Question 3

A muscle named 'flexor carpi ulnaris' most likely has which of the following characteristics?

Accepted Answer

It flexes the wrist and is located on the ulnar side.

Question 4

Which muscle is part of the rotator cuff and is responsible for lateral rotation of the shoulder?

Accepted Answer

Infraspinatus

Question 5

If the flexor retinaculum at the wrist becomes inflamed and compresses the structures beneath it, which clinical condition is most likely to develop?

Accepted Answer

Carpal tunnel syndrome

Question 6

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

Accepted Answer

Extension (plantar flexion) at the ankle

Question 7

A patient with a ruptured Achilles tendon would most likely have difficulty performing which movement?

Accepted Answer

Plantar flexion of the foot

Question 8

Which muscle is the major flexor of the elbow and also stabilizes the shoulder joint?

Accepted Answer

Biceps brachii

Question 9

Which of the following muscle names indicates a muscle with four heads?

Accepted Answer

Quadriceps

Question 10

A muscle that is described as 'rectus' in its name most likely has which of the following characteristics?

Accepted Answer

It is straight in orientation.

Question 11

Which of the following best describes the function of a synergist muscle?

Accepted Answer

It assists a larger agonist and helps start motion or stabilize the origin.

Question 12

Which muscle is responsible for flexion and adduction at the hip, and is also the most medial muscle of the thigh?

Accepted Answer

Gracilis

Question 13

A patient is unable to extend their knee. Which group of muscles is most likely affected?

Accepted Answer

Quadriceps femoris

Question 14

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

Accepted Answer

Teres major

Question 15

If a muscle is named 'extensor digitorum', what is its likely action?

Accepted Answer

Extension of the fingers

Question 16

Which muscle is primarily responsible for raising the eyebrows and wrinkling the forehead?

Accepted Answer

Occipitofrontalis (frontal belly)

Question 17

A muscle with the name 'transversus abdominis' is most likely oriented in which direction?

Accepted Answer

Perpendicular (crosswise) to the midline

Question 18

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

Accepted Answer

Rotates and flexes the neck

Question 19

A patient is unable to move food around their cheeks while chewing. Which muscle is most likely affected?

Accepted Answer

Buccinator

Question 20

Which of the following equations best represents the relationship between muscle force ($F$), lever arm length ($r$), and torque ($	au$) produced at a joint?

Accepted Answer

$	au = F 	imes r$

Muscular System: Structure, Function, and Nomenclature

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