Chapter 79: Parathyroid Hormone, Calcitonin, Calcium and Phosphate Metabolism, Vitamin D, Bone, and Teeth

Chapter 79: Parathyroid Hormone, Calcitonin, Calcium and Phosphate Metabolism, Vitamin D, Bone, and Teeth

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

1. A man consumes a high Ca²⁺ Which of the following would be an appropriate compensatory response to the postprandial changes in plasma [Ca²⁺] concentration?

1. Increased calcitonin secretion
2. Increased formation of 1,25-(OH)₂D₃
3. Increased osteoclastic activity
4. Increased renal Ca²⁺ reabsorption
5. Increased osteocytic osteolysis

ANS: A

2. Which of the following is not a direct effect of PTH?

1. Increased renal Ca²⁺ reabsorption
2. Decreased renal phosphate reabsorption
3. Increased intestinal Ca²⁺ and phosphate absorption
4. Increased Ca²⁺ and phosphate resorption from bone
5. Increased renal production of 1,25-(OH)₂D₃

ANS: C

3. Which of the following would cause the most rapid increase in free ionized plasma Ca²⁺ concentration?

1. Increased osteocytic osteolysis
2. Increased osteoclastic activity
3. Increased formation of 1,25-(OH)₂D₃
4. Increased renal Ca²⁺ reabsorption
5. Increased intestinal Ca²⁺ absorption

ANS: A

Questions 4-6: Match each of the following patients in questions 4 and 6 with the following physiological changes.

Plasma [PTH]             Plasma [1,25-(OH)₂D₃]          Plasma [Phosphate]

1. ­                                  ­                                              ¯
2. ­                                  ¯                                              ­
3. ­                                  ¯                                              ¯
4. ¯                                  ­                                              ­
5. ¯                                  ¯                                              ¯

4. Most patients with rickets.

ANS: C