Question 1

Which of the following best describes the primary function of osteoclasts in bone tissue?

Accepted Answer

They break down bone matrix, releasing minerals through osteolysis.

Question 2

A patient presents with bowed legs and a history of minimal sun exposure. Laboratory tests reveal low calcium and phosphate absorption. Which vitamin deficiency is most likely responsible for this condition?

Accepted Answer

Vitamin D3

Question 3

Which of the following equations correctly represents the main mineral component of bone matrix?

Accepted Answer

$$\mathrm{Ca_3$(PO_4$)_2}$$

Question 4

During the process of endochondral ossification, what is the correct sequence of events?

Accepted Answer

Chondrocytes enlarge and die, bone formation starts at shaft surface, blood vessels invade, spongy bone forms in shaft, secondary ossification centers develop.

Question 5

Which of the following best explains why spongy bone is found in the epiphyses of long bones?

Accepted Answer

It is lighter and can withstand stresses from multiple directions.

Question 6

A 65-year-old woman suffers a hip fracture after a minor fall. Her bone density is significantly reduced. Which condition is most likely responsible for her increased fracture risk?

Accepted Answer

Osteoporosis

Question 7

Which hormone increases blood calcium levels by stimulating osteoclast activity and enhancing intestinal absorption of calcium?

Accepted Answer

Parathyroid hormone (PTH)

Question 8

Which of the following bone markings is correctly matched with its function?

Accepted Answer

Fossa – depression for articulation with another bone

Question 9

A child is diagnosed with a greenstick fracture. Which of the following best describes this type of fracture?

Accepted Answer

Only one side of the bone is broken and the other is bent.

Question 10

Which of the following best describes the role of the periosteum in bone growth and repair?

Accepted Answer

It isolates bone from surrounding tissue and contains cells for bone growth and repair.

Question 11

Which of the following is a distinguishing feature of cervical vertebrae compared to thoracic and lumbar vertebrae?

Accepted Answer

Transverse foramina in the transverse processes

Question 12

A patient with a herniated intervertebral disc is most likely experiencing damage to which structure?

Accepted Answer

The fibrocartilage layer of the intervertebral disc

Question 13

Which of the following movements is an example of abduction?

Accepted Answer

Moving the arm away from the midline of the body

Question 14

Which of the following bones is NOT part of the axial skeleton?

Accepted Answer

Femur

Question 15

Which of the following best explains why the epiphyseal plate is important during childhood and adolescence?

Accepted Answer

It is the site of endochondral ossification, allowing for bone lengthening.

Question 16

Which of the following is a correct description of the acetabulum?

Accepted Answer

A socket in the pelvis that articulates with the head of the femur

Question 17

Which of the following best describes the process of bone remodeling?

Accepted Answer

Osteoclasts remove bone matrix while osteoblasts build new matrix, maintaining a balance.

Question 18

A patient is unable to rotate their forearm so that the palm faces upward. Which movement is impaired?

Accepted Answer

Supination

Question 19

Which of the following is a characteristic of a synovial joint?

Accepted Answer

Joint cavity is filled with synovial fluid, allowing free movement.

Question 20

Which of the following best explains why regular exercise is important for bone health?

Accepted Answer

Exercise increases bone thickness and strength by stimulating bone remodeling.

The Skeletal System: Structure, Function, and Anatomy

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