Question 1

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

Accepted Answer

The origin is the attachment to the stationary bone (usually proximal), while the insertion is to the movable bone (usually distal).

Question 2

A boxer throws a punch, causing protraction of the scapula. Which muscle is primarily responsible for this movement?

Accepted Answer

Serratus anterior

Question 3

Which muscle is the prime mover for abduction of the arm at the shoulder joint?

Accepted Answer

Deltoid

Question 4

During elbow flexion, which muscle acts as the antagonist to the biceps brachii?

Accepted Answer

Triceps brachii

Question 5

Which arrangement of fascicles allows a muscle to form a sphincter and close an opening?

Accepted Answer

Circular

Question 6

A patient is unable to raise their arm above their head due to injury. Which part of the trapezius muscle is most likely affected?

Accepted Answer

Upper fibers

Question 7

Which muscle is known as the 'climber's muscle' due to its role in extending, adducting, and medially rotating the arm?

Accepted Answer

Latissimus dorsi

Question 8

If a muscle has fascicles arranged on both sides of a tendon, what is this arrangement called?

Accepted Answer

Bipennate

Question 9

Which muscle is responsible for flexing and supinating the forearm at the elbow joint?

Accepted Answer

Biceps brachii

Question 10

A muscle is named 'biceps.' What does this indicate about its structure?

Accepted Answer

It has two origins.

Question 11

Which muscle is primarily responsible for smiling by elevating the corners of the mouth?

Accepted Answer

Zygomaticus major

Question 12

Which muscle is the main flexor of the forearm at the elbow when the forearm is in a mid-pronated position?

Accepted Answer

Brachioradialis

Question 13

Which muscle group stabilizes the shoulder joint and is often injured in athletes who perform overhead movements?

Accepted Answer

Rotator cuff muscles

Question 14

During mastication, which muscle is primarily responsible for elevating the mandible?

Accepted Answer

Masseter

Question 15

Which muscle originates from the sternum and clavicle and inserts onto the mastoid process of the skull, allowing rotation and flexion of the neck?

Accepted Answer

Sternocleidomastoid

Question 16

A muscle with fascicles that are nearly parallel to the longitudinal axis and taper at both ends is classified as:

Accepted Answer

Fusiform

Question 17

Which muscle is responsible for closing the eye and producing wrinkles at the lateral corner?

Accepted Answer

Orbicularis oculi

Question 18

If a muscle contracts but no movement occurs, such as tensing the jaw by clenching the teeth, what type of contraction is this?

Accepted Answer

Isometric contraction

Question 19

Which equation best represents the relationship between force ($$F$$), cross-sectional area ($$A$$), and muscle tension ($$T) in $$skeletal muscle physiology?

Accepted Answer

$$F = T 	imes A$$

Question 20

A patient presents with difficulty supinating their forearm. Which muscle is most likely impaired?

Accepted Answer

Biceps brachii

Muscular System: Structure, Function, and Major Muscles

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