Question 1

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

Accepted Answer

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

Question 2

A child is diagnosed with rickets, a disease characterized by soft, weak bones. Which deficiency is most likely responsible for this condition?

Accepted Answer

Deficiency of vitamin D, resulting in poor calcium absorption.

Question 3

Which equation correctly represents the chemical reaction for the formation of hydroxyapatite, the main inorganic component of bone?

Accepted Answer

$$Ca_3$$($$PO_4)_2 + Ca(OH)_2$$ \rightarrow $$Ca_5$$($$PO_4)_3OH$

Question 4

During bone growth, which structure is responsible for lengthening of long bones in children and adolescents?

Accepted Answer

Epiphyseal plate (growth plate)

Question 5

A patient with osteoporosis is at increased risk for fractures due to decreased bone mass. Which process is most likely impaired in this condition?

Accepted Answer

Bone formation by osteoblasts is decreased.

Question 6

Which of the following best explains why blood calcium levels are tightly regulated in the human body?

Accepted Answer

Calcium is required for muscle contraction, nerve transmission, and blood clotting.

Question 7

Which hormone increases blood calcium levels by stimulating osteoclasts to break down bone matrix?

Accepted Answer

Parathyroid hormone (PTH)

Question 8

A fracture occurs in the diaphysis of the femur. Which type of bone tissue is primarily affected?

Accepted Answer

Compact bone (dense bone)

Question 9

Which cell type is responsible for synthesizing the organic components of bone matrix, including collagen?

Accepted Answer

Osteoblasts

Question 10

Which of the following best describes the process of endochondral ossification?

Accepted Answer

Bone replaces a pre-existing cartilage model during development.

Question 11

A patient has a tumor that is producing excess calcitonin. What effect would this have on blood calcium levels?

Accepted Answer

Blood calcium levels would decrease due to increased bone deposition.

Question 12

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

Accepted Answer

Hematoma formation, fibrocartilaginous callus formation, bony callus formation, bone remodeling

Question 13

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

Accepted Answer

It covers the outer surface of bone and contains osteogenic cells for growth and repair.

Question 14

Which of the following is a function of the skeletal system?

Accepted Answer

Protection of internal organs

Question 15

Which of the following best explains why children have a higher rate of bone growth compared to adults?

Accepted Answer

Children have open epiphyseal plates allowing for continued lengthening of bones.

Question 16

Which of the following is NOT a component of the organic matrix of bone?

Accepted Answer

Hydroxyapatite

Question 17

A patient presents with low blood calcium levels. Which physiological response would you expect?

Accepted Answer

Increased secretion of parathyroid hormone (PTH)

Question 18

Which of the following best describes the difference between compact bone and spongy bone?

Accepted Answer

Compact bone is dense and forms the outer layer of bones, while spongy bone is porous and found at the ends of long bones.

Question 19

Which of the following equations represents the relationship between bone mass, bone formation, and bone resorption?

Accepted Answer

$$	ext{Bone Mass} = 	ext{Bone Formation} - 	ext{Bone Resorption}$$

Bone Structure, Function, and Physiology: Study Notes for Anatomy & Physiology

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