Question 1

Which statement best describes the function of the muscular system?

Accepted Answer

It produces body movements and stabilizes the body, such as maintaining posture or joint position.

Question 2

When a skeletal muscle contracts, which bone is typically moved?

Accepted Answer

The distal bone, where the muscle inserts.

Question 3

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

Accepted Answer

Parallel

Question 4

A muscle with short, thick fascicles and a tendon that runs nearly the entire length of the muscle is most likely to be:

Accepted Answer

Pennate

Question 5

Which muscle arrangement is best suited for producing the most power?

Accepted Answer

Pennate

Question 6

If the biceps brachii is the agonist in elbow flexion, what role does the triceps brachii play?

Accepted Answer

Antagonist

Question 7

Which muscle is responsible for compressing the cheeks against the teeth, aiding in mastication and whistling?

Accepted Answer

Buccinator

Question 8

A patient presents with difficulty elevating the mandible to close the mouth. Which muscle is most likely impaired?

Accepted Answer

Masseter

Question 9

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

Accepted Answer

Quadriceps

Question 10

A runner complains of pain radiating down the lateral thigh and into the foot, especially after long runs. Spasm of which muscle group is most likely responsible?

Accepted Answer

Gluteus medius/minimus

Question 11

Which muscle is most likely to be involved in Piriformis syndrome, causing compression of the sciatic nerve?

Accepted Answer

Piriformis

Question 12

During forced exhalation and childbirth, which abdominal muscle is most important for increasing intra-abdominal pressure?

Accepted Answer

Rectus abdominis

Question 13

Which muscle is responsible for dorsiflexion of the foot at the ankle joint and inversion of the foot at the intertarsal joints?

Accepted Answer

Tibialis anterior

Question 14

A patient is unable to extend their fingers at the interphalangeal and metacarpophalangeal joints. Which muscle is most likely affected?

Accepted Answer

Extensor digitorum

Question 15

Which muscle is the strongest flexor of the forearm at the elbow joint?

Accepted Answer

Brachialis

Question 16

If both sternocleidomastoid muscles contract together, what is the resulting action?

Accepted Answer

Extension of the head and neck and elevation of the sternum during deep breathing.

Question 17

Which muscle is responsible for plantarflexion of the foot at the ankle joint and flexion of the lower leg at the knee joint?

Accepted Answer

Gastrocnemius

Question 18

Which equation best represents the relationship between muscle force ($$F$$), cross-sectional area ($$A$$), and muscle stress ($$\sigma$$)?

Accepted Answer

$$\sigma = \frac{F}{A}$$

Question 19

Which muscle is most likely to be involved in stabilizing the scapula during arm motion, especially when punching or pushing?

Accepted Answer

Serratus anterior

Question 20

A patient with Thoracic Outlet Syndrome is most likely experiencing compression of the brachial plexus due to tightness in which muscle group?

Accepted Answer

Scalenes

Lecture 9: The Muscular System – Structure and Function of Skeletal Muscles

Guida di studio - Domande di pratica

Study guide - Flashcard