Question 1

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

Accepted Answer

It is the primary site of blood cell formation (hematopoiesis).

Question 2

A patient with severe anemia may experience a conversion of yellow bone marrow to red bone marrow. What is the physiological reason for this adaptation?

Accepted Answer

To enhance the production of blood cells to compensate for low oxygen-carrying capacity.

Question 3

Which structure in compact bone allows blood vessels and nerves to travel perpendicular to the osteons?

Accepted Answer

Perforating canal (Volkmann's canal)

Question 4

During bone remodeling, which cell type is responsible for bone resorption, and what is the main chemical it secretes to degrade bone matrix?

Accepted Answer

Osteoclasts; secrete hydrogen ions and acids

Question 5

Which hormone increases blood calcium levels by stimulating osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 6

A long bone fracture in a child occurs at the epiphyseal plate. What is the most significant consequence of this type of injury?

Accepted Answer

Disruption of longitudinal bone growth

Question 7

Which of the following best explains why compact bone is found in the diaphysis of long bones?

Accepted Answer

It forms a strong, protective layer to resist bending and torsion forces.

Question 8

Which equation correctly represents the relationship between bone mineral density (BMD), calcium content ($C_{Ca}$), and bone volume ($V_{bone}$)?

Accepted Answer

$BMD = \frac{C_{Ca}}{V_{bone}}$

Question 9

Which of the following is a direct effect of vitamin D deficiency on bone physiology?

Accepted Answer

Reduced calcium absorption from the gut, leading to decreased bone mineralization

Question 10

A patient presents with brittle bones that fracture easily. Which component of the bone matrix is most likely deficient?

Accepted Answer

Organic matrix (collagen fibers)

Question 11

Which process is described by the following steps: osteogenic cells undergo mitosis, differentiate into osteoblasts, and secrete organic matrix that later calcifies?

Accepted Answer

Ossification (osteogenesis)

Question 12

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

Accepted Answer

They connect osteocytes, allowing nutrients and waste to move between cells and blood vessels.

Question 13

During endochondral ossification, which event occurs first in the development of a long bone?

Accepted Answer

Osteogenic cells in the perichondrium differentiate into osteoblasts and form a bone collar

Question 14

Which of the following is TRUE regarding the difference between primary and secondary bone tissue?

Accepted Answer

Secondary bone has more inorganic matrix and regularly arranged collagen bundles, providing greater strength.

Question 15

Which feedback mechanism is involved when calcitonin is released in response to high blood calcium levels?

Accepted Answer

Negative feedback to decrease blood calcium by stimulating osteoblasts

Question 16

A bone fracture that results in multiple fragments is classified as which type?

Accepted Answer

Comminuted fracture

Question 17

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

Accepted Answer

It allows bones to resist forces from many directions and provides space for bone marrow.

Question 18

Which of the following equations correctly represents the process of bone deposition by osteoblasts, where $M_{organic}$ is the mass of organic matrix and $t$ is time?

Accepted Answer

$M_{organic} = k 	imes t$

Question 19

Which of the following is a function of Sharpey's fibers (perforating fibers) in bone?

Accepted Answer

They anchor the periosteum firmly to the underlying bone surface.

Chapter 6

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