$$ \text{Net Bone Mass Change} = \text{Bone Formation} - \text{Bone Resorption} $$

Question 1

Which of the following is NOT a primary function of the skeletal system?

Accepted Answer

Regulation of body temperature

Question 2

A patient has a genetic disorder that prevents the formation of hydroxyapatite crystals in bone. Which property of bone would be most affected?

Accepted Answer

Resistance to compression

Question 3

Which cell type is responsible for breaking down bone matrix during bone remodeling?

Accepted Answer

Osteoclast

Question 4

During bone growth, which process describes the replacement of cartilage with bone?

Accepted Answer

Ossification

Question 5

A child with a vitamin D deficiency is likely to have impaired bone growth due to poor absorption of which mineral?

Accepted Answer

Calcium

Question 6

Which hormone increases osteoclast activity to raise blood calcium levels?

Accepted Answer

Parathyroid hormone (PTH)

Question 7

What is the main function of the periosteum?

Accepted Answer

It isolates and protects the bone from surrounding tissues.

Question 8

Which of the following best describes the composition of the bone matrix?

Accepted Answer

2/3 calcium phosphate and 1/3 collagen fibers

Question 9

A fracture that damages the epiphyseal plate in a growing child is most likely to affect which process?

Accepted Answer

Longitudinal bone growth

Question 10

Which of the following best explains why bones are both strong and somewhat flexible?

Accepted Answer

The combination of hydroxyapatite crystals and collagen fibers

Question 11

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

Accepted Answer

Spongy bone becomes less dense and more fragile

Question 12

Which of the following is the correct sequence of events in endochondral ossification?

Accepted Answer

Cartilage model forms → cartilage is replaced by bone → epiphyseal plate ossifies

Question 13

Which bone cell type is primarily responsible for producing new bone matrix?

Accepted Answer

Osteoblast

Question 14

If a patient has a mutation that prevents the formation of the periosteum, which of the following would most likely occur?

Accepted Answer

The bone would be more susceptible to damage from surrounding tissues and have impaired growth and repair.

Question 15

Which of the following best describes appositional bone growth?

Accepted Answer

Increase in bone diameter by addition of new bone to the surface

Question 16

A patient with hyperparathyroidism (excess PTH) would most likely exhibit which of the following symptoms?

Accepted Answer

Elevated blood calcium levels due to increased osteoclast activity

Question 17

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

Accepted Answer

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

Question 18

Which of the following best describes the role of osteoprogenitor cells?

Accepted Answer

They divide and differentiate to form new osteoblasts.

Question 19

A 25-year-old athlete suffers a fracture. Which of the following steps occurs first in the repair process?

Accepted Answer

Formation of a hematoma at the fracture site

Question 20

Which of the following statements about compact and spongy bone is correct?

Accepted Answer

Both have the same matrix composition but differ in their three-dimensional arrangement.

The Skeletal System: Osseous Tissue and Skeletal Structure

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