$$\text{Ca}^{++}~\text{from Bone} \longrightarrow \text{Blood}$$

$$\text{Ca}^{++}~\text{from Blood} \longrightarrow \text{Bone}$$

Question 1

Which process is responsible for the formation of most flat bones, such as those of the skull, during fetal development?

Accepted Answer

Intramembranous ossification

Question 2

During endochondral ossification, which tissue is initially replaced by bone?

Accepted Answer

Hyaline cartilage

Question 3

A patient presents with a bone fracture where the bone ends penetrate the skin. What type of fracture is this?

Accepted Answer

Compound fracture

Question 4

Which hormone is released by the parathyroid gland in response to low blood calcium levels, and what is its primary effect?

Accepted Answer

Parathyroid hormone (PTH); increases osteoclast activity

Question 5

Which vitamin is essential for the absorption of calcium from the digestive tract, and what condition results from its deficiency in children?

Accepted Answer

Vitamin D; rickets

Question 6

If blood calcium levels are elevated, which hormone is secreted to lower them, and what is one of its mechanisms?

Accepted Answer

Calcitonin; inhibits osteoclast activity

Question 7

A 65-year-old woman is diagnosed with osteoporosis. Which of the following best describes the underlying mechanism?

Accepted Answer

Decreased bone formation and increased bone resorption

Question 8

Which of the following factors would most likely stimulate osteoblast activity and promote bone growth?

Accepted Answer

High levels of calcium and phosphorus

Question 9

A child with inadequate exposure to sunlight and a poor diet develops soft, rubbery bones. What is the most likely diagnosis?

Accepted Answer

Rickets

Question 10

Which equation best represents the movement of calcium when blood calcium levels are low?

Accepted Answer

$$	ext{Ca}^{++}~	ext{from Bone} \longrightarrow 	ext{Blood}$$

Question 11

Which hormone increases the synthesis of bone protein and is secreted by the pancreas?

Accepted Answer

Insulin

Question 12

A patient with a thyroid tumor is producing excess calcitonin. What effect would this have on their blood calcium levels?

Accepted Answer

Blood calcium levels would decrease due to increased osteoblast activity.

Question 13

Which of the following is NOT a direct effect of parathyroid hormone (PTH)?

Accepted Answer

Inhibiting osteoblast activity

Question 14

A fracture that results from twisting forces and causes the bone to break into several pieces is best described as:

Accepted Answer

Comminuted fracture

Question 15

Which of the following best explains why elderly individuals are more prone to bone fractures?

Accepted Answer

They have thinner and weakened bones due to decreased bone mass.

Question 16

Which hormone is primarily responsible for stimulating bone growth during childhood and adolescence?

Accepted Answer

Growth hormone

Question 17

Which of the following is a homeostatic imbalance of bone characterized by softening of bones in adults due to vitamin D deficiency?

Accepted Answer

Osteomalacia

Question 18

Which of the following best describes the role of calcitriol in calcium homeostasis?

Accepted Answer

It increases calcium absorption in the intestines.

Question 19

A patient with chronic kidney disease is unable to activate vitamin D. What effect would this have on their bone health?

Accepted Answer

Decreased bone mineralization due to reduced calcium absorption

Question 20

Which of the following equations best represents the effect of calcitonin on calcium movement when blood calcium levels are high?

Accepted Answer

$$	ext{Ca}^{++}~	ext{from Blood} \longrightarrow 	ext{Bone}$$

Chapter 6: Skeletal System – Bone Tissue, Development, Fractures, and Calcium Homeostasis

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