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 & Explanation:
Chemical properties are properties that can be measured or observed only when matter undergoes a change to become an entirely different kind of matter. They include reactivity, flammability, and the ability to rust. Reactivity is the ability of matter to react chemically with other substances.
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The purpose of the organs of the male reproductive system is to perform the following functions:
-To produce, maintain, and transport sperm (the male reproductive cells) and protective fluid (semen)
-To discharge sperm within the female reproductive tract during sex
-To produce and secrete male sex hormones responsible for maintaining the male reproductive system.
Unlike the female reproductive system, most of the male reproductive system is located outside of the body. These external structures include the penis, scrotum, and testicles.
Answer:
The Maria's description of her fear is a common case of a Phobia.
Explanation:
The baseball caps are making Maria to experience some symptoms that can be diagnosed as a phobia. She is suffering from emotional distress when she is near a person wearing a baseball cap and this stress is affecting her personal life.
The frontal lobe controls key functions such as movement. Damage to the frontal lobe can cause motor weakness.
