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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True..............,,,........
I think the main difference is that the id means primal impulses, but superego means primal impulses and self control together.
Answer is A. More than 90 degrees and you're not getting the full work out, less than 90 degrees and you're burning energy unnecessarily
The statement 'the body is very complex, so energy moves many different ways' is TRUE about the study of biometrics.
<h3>What is biometrics?</h3>
Biometrics refers to the discipline aimed at measuring different body parts in order to associate this info with specific features.
Moreover, the human body is very complex because it is composed of different organ systems that work together to perform specific functions.
The human body requires to maintain a delicate state of internal equilibrium between energy and matter to perform different physiological processes.
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