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.
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Answer:
genetics
Explanation:
Addiction does not have to do with lack of morals or weak willpower. The chemical reactions that occur in a person’s brain when they are addicted are noticeably different than the ones that occur in a person without one. That is why some people can smoke cigarettes on occasion for pleasure while others need them much more frequently in order to function.
Because people on medicare with 100% rates pay more of the tax for care just like it does with 500%, It just depends on your coverage
Red blood cells deliever oxygen
