Calcium - Regulation of calcium - Vitamin D3 (Calcitriol)

3 important questions on Calcium - Regulation of calcium - Vitamin D3 (Calcitriol)

What does vitamin D3 have to do with calcium?

PTH stimulates 1a-hydroxylase in kidneys to convert prehormone of calcitriol (calcidiol) to convert it to calcitriol

How does calcitriol lead to increased blood calcium?

1. Active transport of Ca2+ from intestine to blood, increases PO4 3-  absorption
2. Active reabsorption of Ca2+ and PO4 3- in kidneys

How does calcitriol control Ca2+ homeostasis?

Increased calcitriol leads to reduced PTH secretion difrectly and indirectly

The question on the page originate from the summary of the following study material:

  • A unique study and practice tool
  • Never study anything twice again
  • Get the grades you hope for
  • 100% sure, 100% understanding
Remember faster, study better. Scientifically proven.
Trustpilot Logo