Regulating Blood Calcium Levels (Vitamin D3 to Calcitriol)

Activating Vitamin D to Calcitriol Step 3

CALCIDOL circulates in blood. As it passes through the blood vessels of the KIDNEY it is converted to CALCITRIOL

How many steps are there in the Enzymatic pathway of Activating Vitamin D to Calcitriol

3 steps

How is Calcitrol converted in the kidney

By KIDNEY ENZYMES when another HYDROXYL GROUP (-OH) is added

How is Calcidol formed by liver enzymes

By the addition of a HYDROXYL GROUP (-OH)

What are the two primary hormones that regulate blood calcium?

Cacitriol (active form of vitamin D) and Parathyroid hormone

Activating Vitamin D to Calcitriol Step 1

UV light converts the precursors molecule in keratinocytes of the skin to VITAMIN D3 which is released into the blood

Calcitriol is the active form of ?

Vitamin D

Activating Vitamin D to Calcitriol Step 2

Vitamin D3 circulates throughout the blood. As it passes through the blood vessels of the LIVER it is converted by liver enzymes to CALCIDOL

The presences of parathyroid hormone increases what ?

the rate of the final enzymatic step in kidney