Question

Which of these hormones increases the rate of $C{a}^{2+}$ absorption from gastrointestinal tract?

• A. Calcitriol
• B. Calcitonin
• C. Aldosterone
• D. Cholecystokinin

Answer 1

The correct option is A Calcitriol

A- Vitamin D (Calcitriol) Bioactive vitamin D or calcitriol is a steroid hormone that has long been known for its important role in regulating body levels of calcium and phosphorus and in mineralization of bone.

B- Calcitonin is a hormone that is produced in humans by the parafollicular cells (commonly known as C-cells) of the thyroid gland. Calcitonin is involved in helping to regulate levels of calcium and phosphate in the blood, opposing the action of parathyroid hormone.

C- Aldosterone is a pregnane-based steroidal hormone produced by the outer-section (zona glomerulosa) of the adrenal cortex in the adrenal gland, and acts on the distal tubules and collecting ducts of the kidney to cause the conservation of sodium, secretion of potassium, increased water retention, and increased blood.

D- A hormone which is secreted by cells in the duodenum and stimulates the release of bile into the intestine and the secretion of enzymes by the pancreas.

So, the correct option is 'Calcitriol".