Question 1

Which system contributes the largest percentage to total body weight in a healthy adult human?

Accepted Answer

Muscular system

Question 2

When performing a biceps curl, which anatomical term describes the point of muscle attachment on the humerus that does NOT move during contraction?

Accepted Answer

Origin

Question 3

A patient presents with difficulty extending their knee. Which muscle group is most likely impaired?

Accepted Answer

Quadriceps femoris

Question 4

Which muscle is the prime mover for elbow flexion during a standard biceps curl?

Accepted Answer

Biceps brachii

Question 5

During forced expiration, which abdominal muscle is primarily responsible for increasing intra-abdominal pressure?

Accepted Answer

Rectus abdominis

Question 6

Which muscle is responsible for plantarflexion of the foot and forms the bulk of the calf?

Accepted Answer

Gastrocnemius

Question 7

A baseball pitcher injures his rotator cuff. Which muscle is NOT part of the rotator cuff group?

Accepted Answer

Teres major

Question 8

Which muscle is the antagonist to the biceps brachii during elbow flexion?

Accepted Answer

Triceps brachii

Question 9

A patient is unable to abduct their arm at the shoulder. Which muscle is most likely affected?

Accepted Answer

Deltoid

Question 10

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

Accepted Answer

Zygomaticus major

Question 11

Which muscle is the prime mover for hip extension when rising from a seated position?

Accepted Answer

Gluteus maximus

Question 12

Which muscle group is responsible for stabilizing and positioning the head and neck?

Accepted Answer

Axial muscles

Question 13

A patient with TMJ syndrome is most likely experiencing dysfunction in which muscle?

Accepted Answer

Masseter

Question 14

Which muscle is responsible for dorsiflexion of the foot?

Accepted Answer

Tibialis anterior

Question 15

Which muscle is a synergist in elbow flexion, assisting the biceps brachii?

Accepted Answer

Brachioradialis

Question 16

Which muscle is involved in forced expiration, vomiting, and childbirth due to its role in increasing intra-abdominal pressure?

Accepted Answer

Rectus abdominis

Question 17

Which muscle is responsible for flexion and lateral rotation of the hip, and is known as the 'tailor's muscle'?

Accepted Answer

Sartorius

Question 18

Which muscle is the prime mover for arm extension, adduction, and medial rotation, especially during a swimming stroke?

Accepted Answer

Latissimus dorsi

Question 19

Which muscle is responsible for closing the mouth and pursing the lips, often called the 'kissing muscle'?

Accepted Answer

Orbicularis oris

Question 20

Which muscle group is primarily responsible for extension of the vertebral column?

Accepted Answer

Erector spinae

Muscular System: Gross Anatomy – Structure, Function, and Organization

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