Question 1

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

Accepted Answer

Production of blood cells through hematopoiesis

Question 2

A patient with a genetic defect in osteoclast function is most likely to develop which of the following conditions?

Accepted Answer

Osteopetrosis

Question 3

Which hormone is primarily responsible for increasing blood calcium levels by stimulating bone resorption?

Accepted Answer

Parathyroid hormone (PTH)

Question 4

During endochondral ossification, what is the first step that occurs in the formation of a long bone?

Accepted Answer

Chondroblasts in the perichondrium differentiate into osteoblasts

Question 5

Which of the following best explains why vitamin D deficiency can lead to bone deformities in children (rickets)?

Accepted Answer

Vitamin D promotes calcium absorption in the intestines

Question 6

A 14-year-old male presents with excessive longitudinal bone growth and open epiphyseal plates. Which hormone imbalance is most likely responsible?

Accepted Answer

Excess growth hormone

Question 7

Which of the following is a distinguishing feature of compact bone compared to spongy bone?

Accepted Answer

Organization into osteons with concentric lamellae

Question 8

Which of the following equations correctly represents the chemical composition of hydroxyapatite, the main inorganic component of bone?

Accepted Answer

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

Question 9

A patient with osteoporosis is at increased risk for fractures due to which of the following changes in bone tissue?

Accepted Answer

Decreased inorganic matrix, making bone brittle

Question 10

Which of the following best describes appositional growth of bone?

Accepted Answer

Growth in width by addition of new circumferential lamellae

Question 11

Which of the following best explains why postmenopausal women are at higher risk for osteoporosis?

Accepted Answer

Decreased estrogen levels reduce inhibition of osteoclast activity

Question 12

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

Accepted Answer

Hematoma, soft callus, bone callus, remodeling

Question 13

Which of the following best describes the role of osteocalcin in bone tissue?

Accepted Answer

It binds to calcium ions and hydroxyapatite crystals to organize the inorganic matrix

Question 14

A patient with achondroplasia has a mutation affecting which process?

Accepted Answer

Endochondral ossification

Question 15

Which of the following best describes the function of canaliculi in compact bone?

Accepted Answer

They connect lacunae and allow communication between osteocytes

Question 16

Which of the following best explains why weight-bearing exercise is recommended for bone health?

Accepted Answer

It stimulates bone deposition in response to compression and tension

Question 17

Which of the following is a correct statement about the zones of the epiphyseal plate during longitudinal bone growth?

Accepted Answer

The zone of proliferation contains chondrocytes undergoing mitosis

Question 18

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

Accepted Answer

Intramembranous ossification forms flat bones from a mesenchymal membrane, while endochondral ossification forms long bones from a cartilage model

Question 19

Which of the following best explains the effect of excessive protein intake on bone health?

Accepted Answer

It decreases blood pH, leading to increased bone resorption to buffer the pH

Bones and Bone Tissue: Structure, Function, and Physiology

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