Question 1

Which of the following best explains why the bones of the lower limb are larger and stronger than those of the upper limb?

Accepted Answer

They must support the weight of the body and provide stability during locomotion.

Question 2

The glenohumeral joint is characterized by which of the following features?

Accepted Answer

It is a ball and socket joint with the largest range of motion in the body.

Question 3

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

Accepted Answer

Rotator cuff muscles

Question 4

Which bone is the only one in the appendicular skeleton that develops via intramembranous ossification rather than endochondral ossification?

Accepted Answer

Clavicle

Question 5

During a fall, a person lands on their outstretched hand. Which bone is most likely to fracture due to its position and function in the wrist?

Accepted Answer

Scaphoid

Question 6

Which of the following statements about the acetabulum is correct?

Accepted Answer

It is a deep socket that provides stability for the hip joint.

Question 7

A soccer player tears their anterior cruciate ligament (ACL). What is the primary function of this ligament in the knee?

Accepted Answer

To resist hyperextension and provide anterior stability to the knee

Question 8

Which of the following best describes the function of the interosseous membrane between the radius and ulna?

Accepted Answer

It maintains the integrity of the forearm and allows for force transmission between the two bones.

Question 9

Which of the following joints allows for the pronation and supination of the forearm?

Accepted Answer

Proximal and distal radioulnar joints

Question 10

A patient is unable to extend their leg at the knee after an injury. Which muscle group is most likely damaged?

Accepted Answer

Quadriceps femoris

Question 11

Which of the following bones does NOT articulate at the knee joint?

Accepted Answer

Fibula

Question 12

The talocrural (ankle) joint is classified as which type of synovial joint, and what movement does it primarily allow?

Accepted Answer

Uniaxial hinge joint; dorsiflexion and plantar flexion

Question 13

Which of the following best explains the functional difference between the pectoral and pelvic girdles?

Accepted Answer

The pectoral girdle allows for greater mobility, while the pelvic girdle provides more stability and weight-bearing support.

Question 14

A patient has lost the ability to flex their forearm at the elbow. Which muscle is most likely paralyzed?

Accepted Answer

Biceps brachii

Question 15

Which of the following statements about the arches of the foot is correct?

Accepted Answer

They distribute body weight and provide spring and leverage during walking.

Question 16

Which of the following is a correct description of the function of the patella?

Accepted Answer

It stabilizes the knee joint and prevents hyperextension.

Question 17

A fracture to which bone would most likely impair the ability to perform opposition of the thumb?

Accepted Answer

First metacarpal

Question 18

Which of the following best describes the role of the acetabular labrum?

Accepted Answer

It deepens the acetabulum to increase stability of the hip joint.

Question 19

Which of the following muscles is responsible for supination of the forearm?

Accepted Answer

Supinator

Question 20

A patient presents with a fracture of the femur. Which of the following equations best estimates the force ($$F) $$required to break the femur, given the stress ($$\sigma) $$and cross-sectional area ($$A) of $$the bone?

Accepted Answer

$$F = \sigma 	imes A$$

Appendicular Skeleton: Structure, Function, and Key Joints

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