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NEET MDS Quiz - Practice Test
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physiology - 3 Questions

1
Physiology

What is the primary effect of parathyroid hormone on serum calcium levels during pregnancy?
1) Decreases serum calcium levels
2) Increases serum calcium levels by mobilizing calcium from maternal bones
3) Has no effect on serum calcium levels
4) Increases serum calcium levels by enhancing calcium absorption in the gut

📝 Explanation:

Answer: 2) The primary effect of parathyroid hormone during pregnancy is to increase serum calcium levels by mobilizing calcium from maternal bones for fetal use.

2
Physiology

What is the most common cause of vitamin D deficiency?
1) Inadequate sunlight exposure
2) Poor dietary intake of vitamin D
3) Impaired liver function
4) Impaired kidney function

📝 Explanation:

Inadequate sunlight exposure is the most common cause of vitamin D deficiency, as sunlight is necessary for the skin to produce vitamin D.

3
Physiology

What is the primary role of the cephalic phase of gastric acid secretion?
1) Stimulation of gastrin release in the stomach
2) Secretion of gastric juices in response to the thought or smell of food
3) Increase in gastric motility
4) Secretion of gastric juices in response to food entering the duodenum

📝 Explanation:

The primary role of the cephalic phase of gastric acid secretion is the secretion of gastric juices in response to the thought or smell of food, preparing the digestive system for incoming food.

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