Question 1

Which of the following best describes the primary function of yellow bone marrow in adults?

Accepted Answer

Fat storage for energy reserves

Question 2

A patient presents with abnormally dense but brittle bones, frequent fractures, and nerve compression symptoms. Which cellular dysfunction is most likely responsible for this condition?

Accepted Answer

Defective osteoclasts

Question 3

Which of the following equations correctly represents the chemical formula for hydroxyapatite, the main inorganic component of bone matrix?

Accepted Answer

$$Ca_{10}(PO_4$)_6(OH)_2$$

Question 4

During endochondral ossification, which event occurs immediately after the formation of the bone collar around the diaphysis of the cartilage model?

Accepted Answer

Internal cartilage calcifies and chondrocytes die

Question 5

Which hormone is primarily responsible for increasing blood calcium levels by stimulating osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 6

A 14-year-old boy is diagnosed with gigantism. Which of the following best explains the underlying cause of his condition?

Accepted Answer

Excessive growth hormone secretion before epiphyseal plate closure

Question 7

Which of the following best describes the role of collagen fibers in the organic matrix of bone?

Accepted Answer

Provide flexible strength and resistance to torsion

Question 8

A patient with osteoporosis is prescribed bisphosphonates. What is the primary mechanism by which these drugs help treat osteoporosis?

Accepted Answer

Decrease osteoclast activity and number

Question 9

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

Accepted Answer

It resists forces from multiple directions and protects bone marrow

Question 10

Which of the following correctly matches the bone cell with its function?

Accepted Answer

Osteoclast: bone resorption

Question 11

A 7-year-old child is diagnosed with rickets. Which of the following is the most likely cause of this condition?

Accepted Answer

Vitamin D deficiency leading to poor bone mineralization

Question 12

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

Accepted Answer

Bone is continuously formed and resorbed to adapt to stress and maintain calcium homeostasis

Question 13

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

Accepted Answer

Hematoma formation → soft callus formation → hard callus ossification → bone remodeling

Question 14

Which of the following best explains why the epiphyseal plate is essential for longitudinal bone growth?

Accepted Answer

It contains proliferating chondrocytes that allow the bone to lengthen

Question 15

A patient with a genetic mutation affecting collagen synthesis is most likely to develop which bone disorder?

Accepted Answer

Osteogenesis imperfecta

Question 16

Which of the following best describes the difference between intramembranous and endochondral ossification?

Accepted Answer

Intramembranous ossification forms flat and irregular bones from a fibrous membrane; endochondral ossification replaces a cartilage model

Question 17

Which of the following best explains the role of vitamin D (calcitriol) in bone health?

Accepted Answer

It increases intestinal absorption of calcium, supporting bone mineralization

Question 18

A 65-year-old woman presents with a hip fracture after a minor fall. Her bone density is significantly reduced. Which of the following is the most likely diagnosis?

Accepted Answer

Osteoporosis

Question 19

Which of the following best describes the function of the periosteum in bone?

Accepted Answer

It covers the outer surface of bone, contains osteogenic cells, and is rich in blood vessels and nerves

Question 20

Which of the following best explains why bone is considered a dynamic tissue?

Accepted Answer

It is constantly being remodeled by the coordinated actions of osteoblasts and osteoclasts

Osseous Tissue and Bone Development: Structure, Function, and Physiology

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