Question 1

Which of the following best describes the role of a synergist muscle during a bicep curl exercise?

Accepted Answer

It assists the biceps brachii by adding extra force and reducing unnecessary movement.

Question 2

A muscle named 'flexor carpi radialis longus' provides which information about its characteristics?

Accepted Answer

It is a long muscle that flexes the wrist on the radial side.

Question 3

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

Accepted Answer

Parallel

Question 4

A patient is unable to voluntarily control urination. Damage to which muscle is most likely responsible?

Accepted Answer

External urethral sphincter

Question 5

Which of the following lever systems is most commonly found in the human body and is exemplified by the action of the biceps brachii during forearm flexion?

Accepted Answer

Third-class lever

Question 6

During inspiration, which muscles contract to enlarge the rib cage?

Accepted Answer

External intercostals and diaphragm

Question 7

Which muscle is the prime mover for thigh flexion at the hip joint?

Accepted Answer

Iliopsoas

Question 8

A person suffers a 'pulled groin' injury. Which muscle group is most likely affected?

Accepted Answer

Adductors of the thigh

Question 9

Which of the following statements about mechanical advantage in lever systems is correct?

Accepted Answer

Mechanical advantage allows a small effort to move a large load.

Question 10

Which muscle is responsible for closing the eyelids and is an example of a circular fascicle arrangement?

Accepted Answer

Orbicularis oculi

Question 11

A patient presents with difficulty abducting the arm at the shoulder. Which muscle is most likely impaired?

Accepted Answer

Deltoid

Question 12

Which of the following muscles is innervated by cranial nerve VII and is essential for nonverbal communication?

Accepted Answer

Orbicularis oris

Question 13

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

Accepted Answer

Quadriceps femoris

Question 14

Which of the following best explains why bipennate and multipennate muscles are more powerful than parallel muscles?

Accepted Answer

They contain more muscle fibers packed into a given area.

Question 15

Which muscle acts as a fixator during the action of raising your arm to the side (abduction)?

Accepted Answer

Rotator cuff muscles

Question 16

Which of the following is a function of the pelvic diaphragm?

Accepted Answer

Seals the inferior outlet of the pelvis and supports pelvic organs

Question 17

If the effort arm is 30 cm and the load arm is 10 cm in a lever system, what is the mechanical advantage (MA)? Use the formula $$MA = \frac{effort\ arm}{load\ arm}.$$

Accepted Answer

$$MA = \frac{30}{10} = 3$$

Question 18

Which muscle is the prime mover for jaw closure during mastication?

Accepted Answer

Masseter

Question 19

Which muscle group is primarily responsible for plantar flexion of the ankle?

Accepted Answer

Posterior compartment muscles of the leg

Question 20

A patient cannot extend their fingers at the metacarpophalangeal joints but can flex them. Which intrinsic hand muscles are most likely impaired?

Accepted Answer

Lumbricals and interossei

The Muscular System: Structure, Function, and Major Muscles

Guida di studio - Domande di pratica

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