Which of the following hormones is currently thought to decrease plasma calcium levels in pregnant women and children?
a. thyroid hormones
b. calcitonin
c. parathyroid hormone (pth)
d. calcitriol

Calcitonin

Explanation:

Calcitonin hormone is released by the para follicular cells of the thyroid gland.   This hormone works against the parathyroid hormone.

Calcitonin hormone regulates the level of calcium by decreasing the blood calcium level. This hormone inhibits the osteoclast activity of the cells and decreases the absorption of calcium in pregnant women and child. Hence, calacitonin decreases plasma calcium levels in pregnant women and children.

Thus, the correct answer is option (B).  

1. desertification

2. captive breeding

3. black rhinoceros

4. renewable resources

explanation:

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consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.