When the skin is exposed to ultraviolet rays, the skin produces a molecule that is turned into Vitamin D.
Sun is the source of ultraviolet rays important for Vitamin D production. Due to this reason, in the case of Vitamin D deficiency, it is recommended by doctor's to absorb sunlight by skin. The Vitamin D production occurs specifically by UV B rays rays which lie in the range of 290-315 nanometer.
The chemical 7-dehydrocholesterol absorbs these rays and convert to previtamin D3. Further, previtamin D3 isomerizes to Vitamin D. Other than sunlight, Vitamin D can be taken through diet. The sources include seafood like fish, fish oil, dairy products, beef liver etc. Vitamin D is required for bone and teeth formation, muscle contraction, immune system etc.
Learn more about Vitamin D -
brainly.com/question/4551554
#SPJ4
A mainly because none of the others are even close to warnings sins and i have my notes and i had this on my health test
Answer:
When a person inhales or comes in direct contact with a pet’s fur, dander, or saliva. The immune system which protects us you from infections, produces a protein, called antibodies, to fight off the foreign bodies. Sometimes, our immune system overreacts to certain substances like animal's fur or feather causing allergic reactions.
Explanation:
