Question

ultraviolet radiation from sunlight cause skin cell to produce __which The liver and kidney modify to promote bone delopment​

Answer 1

Explanation:

Ultraviolet radiation from sunlight causes skin cells to produce _______ _, which the liver and kidneys modify to promote bone development.

ans. Vitamin D

Answer 2

Answer: Vitamin D is produced by skin cells using Ultraviolet radiations from sunlight, which the liver and kidney modifies to promote bone development.

Explanation:

UV Radiations promote Vitamin D formation:-

• When humans are exposed to sunlight, UV-B radiations of the Sun is absorbed by the lipid bi-layer of the plasma membrane of the skin

• This energy in the form of radiations is transformed into a new molecule - 'pre-vitamin D₃'

• 'Pre-vitamin D₃' is converted into 'Vitamin D₃' (a type of Vitamin D obtained from sunlight) with the help of enzymes, which is then ejected out of the plasma membrane into the blood circulation via extracellular spaces

Role of Liver and Kidney in promotion of bone development:-

• The Vitamin D₃ in blood enters the liver where it gets chemically modified by various enzymes

• Vitamin D₃ then enters the kidney with the blood, where it gets activated

• Active Vitamin D₃ then aids in increasing the absorption of Calcium and Phosphorus in the intestine

• Normal levels of blood calcium and phosphorus supports supports mineralization of the bones.