Question 1

Which of the following best describes the arrangement and functional advantage of pennate muscles compared to parallel muscles?

Accepted Answer

Pennate muscles have fibers that pull at an angle relative to the tendon, allowing for greater tension production but less range of motion.

Question 2

A patient is unable to extend their knee after a sports injury. Which muscle group is most likely damaged?

Accepted Answer

Quadriceps femoris

Question 3

Which lever class is most common in the human body and what is its primary mechanical advantage?

Accepted Answer

Third-class lever; increases speed and distance at the expense of force

Question 4

The biceps brachii muscle is an example of which fascicle arrangement, and what is a key functional consequence?

Accepted Answer

Parallel; allows for greater range of motion but less force

Question 5

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

Accepted Answer

Biceps brachii

Question 6

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

Accepted Answer

It flexes the wrist and is located near the ulna.

Question 7

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

Accepted Answer

Teres major

Question 8

During a push-up, which muscle acts as the primary antagonist to the pectoralis major during the upward phase?

Accepted Answer

Latissimus dorsi and posterior deltoid

Question 9

Which muscle is responsible for plantar flexion at the ankle and shares the calcaneal tendon?

Accepted Answer

Gastrocnemius

Question 10

A muscle with the term 'oblique' in its name most likely has fibers that:

Accepted Answer

Run at a slant to the long axis of the body

Question 11

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

Accepted Answer

Turns the head obliquely to the opposite side

Question 12

Which muscle group is primarily responsible for adduction of the thigh?

Accepted Answer

Adductor group (adductor longus, adductor magnus, gracilis)

Question 13

Which of the following is a function of the muscles of the pelvic floor?

Accepted Answer

Support organs of the pelvic cavity and control movement through the urethra and anus

Question 14

Which muscle is the primary abductor of the arm at the shoulder joint?

Accepted Answer

Deltoid

Question 15

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

Accepted Answer

Tibialis anterior

Question 16

Which of the following best explains why third-class levers are most common in the human body?

Accepted Answer

They allow for greater speed and range of motion, which is advantageous for most body movements.

Question 17

Which muscle is primarily responsible for closing the mouth and is the strongest jaw muscle?

Accepted Answer

Masseter

Question 18

Which of the following terms indicates a muscle that is located within the structure it acts upon?

Accepted Answer

Intrinsic

Question 19

Which muscle assists the biceps brachii in flexing the elbow and is located on the lateral side of the forearm?

Accepted Answer

Brachioradialis

Question 20

Which of the following best describes the role of synergist muscles during movement?

Accepted Answer

They assist the agonist by adding extra force or reducing unnecessary movement.

Study Guide: The Muscular System (Anatomy & Physiology, Chapter 11)

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