$$\text{Ca}^{2+} + \text{PO}_4$$^{3-}$$ \rightarrow \text{Ca}_3(\text{PO}_4)_2$$

Question 1

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

Accepted Answer

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

Question 2

During endochondral ossification, what is the primary event that occurs after the cartilage matrix calcifies?

Accepted Answer

Blood vessels invade the cartilage, and perichondrium becomes periosteum.

Question 3

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

Accepted Answer

Parathyroid hormone (PTH)

Question 4

A child’s medullary cavity is filled with red bone marrow. What is the primary function of this tissue?

Accepted Answer

Production of blood cells (hematopoiesis)

Question 5

Which of the following best explains why spongy bone is lighter than compact bone?

Accepted Answer

Spongy bone is composed of trabeculae with spaces for bone marrow.

Question 6

Which equation best represents the relationship between calcium and phosphate in the bone matrix?

Accepted Answer

$$	ext{Ca}^{2+} + 	ext{PO}_4$$^{3-}$$ ightarrow 	ext{Ca}_3(	ext{PO}_4)_2$$

Question 7

What is the structural unit of compact bone, and what is its main function?

Accepted Answer

Osteon; provides strength and houses blood vessels

Question 8

Which vitamin is essential for collagen synthesis and osteoblast development during bone remodeling?

Accepted Answer

Vitamin C

Question 9

A fracture occurs in the diaphysis of a long bone. Which sequence correctly describes the steps of repair?

Accepted Answer

Hematoma formation, cartilage callus formation, bony callus formation, bone remodeling

Question 10

Which process is responsible for the increase in diameter of a bone during growth?

Accepted Answer

Appositional growth

Question 11

During puberty, sex hormones accelerate bone growth. What is the consequence of this acceleration?

Accepted Answer

Osteoblasts produce bone faster than epiphyseal cartilage grows, leading to closure of the growth plate.

Question 12

Which of the following best describes the role of calcitriol in bone physiology?

Accepted Answer

Calcitriol is essential for calcium and phosphate absorption in the digestive system.

Question 13

If a patient has a deficiency in vitamin D3, which of the following is most likely to occur?

Accepted Answer

Decreased calcium absorption in the digestive tract

Question 14

Which of the following statements about the periosteum is correct?

Accepted Answer

The periosteum covers the outer surface of bone and contains blood vessels and nerves.

Question 15

Which bone cell is primarily responsible for producing new bone matrix during bone growth?

Accepted Answer

Osteoblast

Question 16

What is the main difference between epiphyseal plates in children and epiphyseal lines in adults?

Accepted Answer

Epiphyseal plates allow for bone growth in length, while epiphyseal lines indicate that growth has stopped.

Question 17

Which of the following best describes the orientation of collagen fibers in compact bone?

Accepted Answer

Collagen fibers are oriented in different directions in each concentric lamella.

Question 18

A patient with increased osteoclast activity and decreased osteoblast activity is most likely to experience which condition?

Accepted Answer

Degenerative bone loss, such as osteoporosis

Question 19

Which of the following is a real-life consequence of insufficient calcium and phosphate salts in the diet?

Accepted Answer

Bones become more flexible and prone to fractures.

Question 20

Which step in fracture repair involves the formation of a large blood clot at the injury site?

Accepted Answer

Hematoma formation

Bones and Osseous Tissue: Structure, Function, and Growth

Study Guide - Practice Questions