<span>mental and emotional health</span>
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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Not taking good care of themselves. Not being active, poor hygiene, bad diet, weak immune system etc
Answer:
The autonomic nervous system
Explanation:
The autonomic nervous system is control mechanism that operates mainly unconciously and governs body functions like heart rate, digestion, pupil response, urination, sexual excitement, and respiratory rate.
Autonomic functions require respiratory control, cardiovascular control, vasomotor activity and some reflex behaviors like coughing, swallowing, vomiting and sneezing
