Question 1

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

Accepted Answer

Osteoclasts break down bone matrix, releasing calcium into the blood.

Question 2

A patient presents with abnormally high blood calcium levels. Which hormone is most likely to be elevated, and what is its primary effect on bone?

Accepted Answer

Calcitonin; stimulates bone deposition

Question 3

Which of the following equations correctly represents the relationship between bone length and growth rate during childhood?

Accepted Answer

$$L = G 	imes t$$

Question 4

During endochondral ossification, which cell type is responsible for depositing new bone matrix on the cartilage model?

Accepted Answer

Osteoblasts

Question 5

A child is diagnosed with achondroplastic dwarfism. Which anatomical feature is most likely affected?

Accepted Answer

Epiphyseal plate growth is impaired

Question 6

Which of the following best explains the effect of parathyroid hormone (PTH) on kidney function?

Accepted Answer

PTH stimulates the kidneys to reabsorb calcium, reducing its loss in the urine

Question 7

Which of the following is a correct sequence of events in the repair of a bone fracture?

Accepted Answer

Hematoma formation → fibrocartilaginous callus formation → bony callus formation → bone remodeling

Question 8

Which of the following statements about Wolff's Law is correct?

Accepted Answer

Bone tissue adapts to the mechanical stresses placed upon it.

Question 9

A patient with osteoporosis is at increased risk for fractures because:

Accepted Answer

Bone resorption exceeds bone deposition, leading to decreased bone mass.

Question 10

Which of the following best describes the function of the extracellular matrix (ECM) in bone tissue?

Accepted Answer

Provides a rigid structure and stores minerals such as calcium and phosphate.

Question 11

Which of the following is a consequence of hypocalcemia on neuromuscular (NM) excitability?

Accepted Answer

Increased NM excitability, leading to muscle spasms and tetany.

Question 12

Which process is primarily responsible for the lengthening of long bones during childhood?

Accepted Answer

Endochondral ossification at the epiphyseal plate

Question 13

Which of the following best describes the role of calcitriol in calcium homeostasis?

Accepted Answer

Stimulates calcium absorption in the intestine

Question 14

Which of the following is NOT a function of bone remodeling?

Accepted Answer

Increasing cartilage formation in adults

Question 15

A patient with osteogenesis imperfecta (brittle bone disease) most likely has a defect in which component of bone?

Accepted Answer

Collagen fibers in the extracellular matrix

Question 16

Which of the following best describes the difference between yellow marrow and red marrow?

Accepted Answer

Yellow marrow stores fat; red marrow produces blood cells.

Question 17

Which of the following is the correct formula for calculating bone mineral density (BMD)?

Accepted Answer

$$BMD = \frac{	ext{Bone mass}}{	ext{Bone volume}}$$

Question 18

Which of the following statements about the epiphyseal plate is correct?

Accepted Answer

It is a region of hyaline cartilage where bone lengthening occurs.

Question 19

Which of the following best explains why bone remodeling is important for adults?

Accepted Answer

It allows bones to adapt to new mechanical stresses and repair microdamage.

Question 20

A patient with rickets is most likely deficient in which nutrient, and what is the primary effect on bone?

Accepted Answer

Vitamin D; impaired mineralization of bone matrix

Skeletal System: Bone Structure, Function, and Calcium Homeostasis

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