Question at position 47 Which of the following hormones promotes the absorption of calcium and phosphate from the digestive tract?Growth hormoneThyroxineParathyroid hormoneCalcitriol单项选择题
A
Growth hormone
B
Thyroxine
C
Parathyroid hormone
D
Calcitriol

Question

Question at position 47 Which of the following hormones promotes the absorption of calcium and phosphate from the digestive tract?Growth hormoneThyroxineParathyroid hormoneCalcitriol

BlackTom AI · Accepted Answer

Question asks which hormone promotes the absorption of calcium and phosphate from the digestive tract.
Option 1: Growth hormone. While growth hormone supports overall growth and metabolism, its primary role is not to enhance intestinal calcium and phosphate absorption; it acts more through IGF-1 effects on tissues and bone growth.
Option 2: Thyroxine. Thyroid hormone regulates metabolic rate and development, but it is not the main driver of gut absorption of minerals; its influence on calcium balance is indirect and not described as the primary mechanism for intestinal absorption.
Option 3: Parathyroid hormone. PTH increases calcium release from bone and reduces urinary calcium excretion, and it indirectly affects gut absorption by stimulating the production of calcitriol in the kidneys. However, the hormone that directly promotes intestinal absorption of calcium and phosphate is not PTH itself, but the active form of vitamin D activated downstream.
Option 4: Calcitriol. Calcitriol, the active form of vitamin D, directly enhances intestinal absorption of both calcium and phosphate by increasing expression of calcium- and phosphate-transporting proteins in the intestinal lining, which is its well-established primary role.
Thus, Calcitriol is the hormone that directly promotes absorption of calcium and phosphate from the digestive tract, whereas the other options do not primarily serve this function.

Question at position 47 Which of the following hormones promotes the absorption of calcium and phosphate from the digestive tract?Growth hormoneThyroxineParathyroid hormoneCalcitriol单项选择题

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