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:
It is located between Nepal and Tibet, an autonomous region of China.
Answer: I would say A is the answer.
Explanation: getting excited when hearing a ring similar to that of winning a casino game would not constitute excitement as there is no direct influence or envolvment with the individual experiencing this excitment to the ringing. the individual is simply hearing this noise and responding with excitment with no direct reasoning behind it, as apposed to all the other scenarios where there is direct influence to constutute a direct resonse.
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The respiratory system can be damaged from smoke inhalation and tar buildup from the chemicals used in tobacco, which can also harm the heart and blood vessels. Two conditions that can be caused from smoking are Heart Disease and Lung Cancer.
