Question 1

Which of the following best describes the function of the periosteum in bone physiology?

Accepted Answer

It provides a route for blood vessels and nerves to enter the bone.

Question 2

A patient presents with abnormally high blood calcium levels. Which hormone is most likely to be elevated, and what is its effect on osteoclast activity?

Accepted Answer

Calcitonin; it inhibits osteoclast activity.

Question 3

Which structure in compact bone allows blood vessels and nerves to travel perpendicular to the long axis of the bone?

Accepted Answer

Perforating canals (Volkmann's canals)

Question 4

During intramembranous ossification, which of the following is the correct sequence of events?

Accepted Answer

Mesenchymal cells cluster, differentiate into osteoblasts, secrete osteoid, and form spongy bone.

Question 5

Which bone cell is primarily responsible for bone resorption and the release of calcium and phosphate into the bloodstream?

Accepted Answer

Osteoclast

Question 6

A 25-year-old athlete increases the intensity of her weight training. According to Wolff's Law, what is the expected effect on her bones?

Accepted Answer

Bone density and strength will increase in response to greater mechanical stress.

Question 7

Which of the following equations correctly represents the process of bone mineralization during calcification?

Accepted Answer

$$Ca^{2+}$$ + $$PO_4$$^{3-} \rightarrow $$Ca_3$$($$PO_4)_2$

Question 8

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

Accepted Answer

They allow osteocytes to communicate and exchange nutrients.

Question 9

A child has a deficiency in Vitamin D. Which of the following physiological effects is most likely to occur?

Accepted Answer

Decreased absorption of calcium and phosphate in the small intestine.

Question 10

Which of the following statements about bone remodeling is correct?

Accepted Answer

It involves the coordinated activity of osteoblasts, osteoclasts, and osteocytes.

Question 11

Which layer of bone contains osteocytes arranged in concentric circles around a central canal?

Accepted Answer

Compact bone (osteon)

Question 12

Which process is responsible for replacing cartilage with bone during fetal development?

Accepted Answer

Ossification

Question 13

Which of the following is a function of the endosteum?

Accepted Answer

It covers the trabeculae of spongy bone and lines the central canals in compact bone.

Question 14

Which of the following best describes appositional growth in bones?

Accepted Answer

It increases the diameter of a developing bone by adding new bone tissue to the surface.

Question 15

Which of the following is NOT a function of bone tissue?

Accepted Answer

Production of insulin

Question 16

A patient with hyperparathyroidism is likely to experience which of the following changes in bone physiology?

Accepted Answer

Increased osteoclast activity leading to bone resorption

Question 17

Which of the following best describes the lamellae in compact bone?

Accepted Answer

Concentric layers of bone matrix surrounding the central canal

Question 18

Which of the following is the correct formula for the hydroxyapatite crystal found in bone matrix?

Accepted Answer

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

Question 19

Which of the following statements about osteocytes is correct?

Accepted Answer

They maintain bone matrix and communicate through canaliculi.

Question 20

Which of the following best explains why spongy bone is arranged into trabeculae?

Accepted Answer

To reduce the weight of the skeleton while supporting bone marrow and resisting multiple lines of stress.

Skeletal System: Structure, Function, and Physiology

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