Biology · Coordination and Control
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The absorption and use of calcium are regulated by:
- A
Parathormone
- B
Adrenaline
- C
Thyroxin
- D
Thiamin
- E
Prolactin
Circulating parathyroid hormone targets the distal convoluted tubule and collecting duct, directly increasing calcium reabsorption.
The correct option for the regulation of calcium absorption and use is Option A (Parathormone), also known as parathyroid hormone (PTH). Parathormone is secreted by the parathyroid glands and plays a vital role in maintaining calcium homeostasis by increasing calcium absorption in the intestines, promoting calcium reabsorption in the kidneys, and stimulating the release of calcium from bones.
Option B: Adrenaline, also known as epinephrine, is not directly involved in the regulation of calcium absorption or use in the body. Its primary functions are related to the fight-or-flight response, such as increasing heart rate and blood pressure.
Option C: Thyroxin, or thyroxine, is a hormone produced by the thyroid gland that regulates metabolism. While thyroid hormones play a role in overall metabolic regulation, they are not directly involved in the regulation of calcium absorption or use.
Option D: Thiamin, also known as vitamin B1, is an essential nutrient involved in energy metabolism. However, it does not directly regulate calcium absorption or use in the body.
Option E: Prolactin is a hormone primarily associated with lactation and milk production in females. It does not have a direct role in the regulation of calcium absorption or use.
Tagged under Biology · Coordination and Control · 2015