Question 1

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

Accepted Answer

They break down and resorb bone tissue, releasing calcium into the blood.

Question 2

A patient presents with a fracture that penetrates the skin. What type of fracture is this, and what is the first step in bone repair?

Accepted Answer

Open fracture; hematoma formation

Question 3

Which hormone is primarily responsible for activating osteoclasts to increase blood calcium levels when they fall below normal?

Accepted Answer

Parathyroid hormone (PTH)

Question 4

Which of the following bones is NOT part of the axial skeleton?

Accepted Answer

Femur

Question 5

A long bone grows in length primarily through which process and at which specific site?

Accepted Answer

Interstitial growth at the epiphyseal plate

Question 6

Which of the following is a correct equation for the chemical composition of hydroxyapatite, the main inorganic component of bone?

Accepted Answer

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

Question 7

A 10-year-old child has a fracture at the epiphyseal plate. What is the most likely long-term complication if not properly treated?

Accepted Answer

Premature closure of the growth plate, leading to limb length discrepancy

Question 8

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

Accepted Answer

It reduces the weight of the bone while providing strength along lines of stress.

Question 9

Which bone marking is correctly matched with its function?

Accepted Answer

Trochanter – large projection for muscle attachment

Question 10

Which of the following statements about cartilage is TRUE?

Accepted Answer

Hyaline cartilage is the most abundant type and provides support with flexibility.

Question 11

A patient with osteoporosis is at increased risk for fractures because:

Accepted Answer

Calcium salts crystallize, making bone more brittle.

Question 12

Which of the following is a function of osteocytes?

Accepted Answer

Detecting mechanical stress and signaling bone remodeling

Question 13

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

Accepted Answer

Endochondral ossification replaces hyaline cartilage, while intramembranous ossification develops from fibrous membrane.

Question 14

Which of the following bones is classified as an irregular bone?

Accepted Answer

Vertebra

Question 15

A patient has a deficiency in vitamin D. Which of the following is the most likely consequence for bone health?

Accepted Answer

Impaired calcium absorption, leading to weaker bones

Question 16

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

Accepted Answer

It covers the external surface of bone, contains osteogenic cells, and serves as an anchoring point for tendons and ligaments.

Question 17

Which of the following equations correctly represents the negative feedback loop for calcium homeostasis involving parathyroid hormone (PTH)?

Accepted Answer

$$	ext{Low blood } Ca$$^{2+}$$ ightarrow 	ext{PTH release} ightarrow 	ext{Osteoclast activation} ightarrow 	ext{Increased blood } Ca$$^{2+}$$

Question 18

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

Accepted Answer

Hematoma formation → Fibrocartilage callus formation → Bony callus formation → Bone remodeling

Question 19

Which of the following statements about bone remodeling is TRUE?

Accepted Answer

Bone remodeling is a continuous process that allows bones to adapt to mechanical stress and maintain calcium homeostasis.

Question 20

Which of the following best explains why the epiphyseal plate is important during childhood and adolescence?

Accepted Answer

It is the site of interstitial growth, allowing bones to lengthen.

Skeletal System: Structure, Function, and Anatomy

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