What is vitamin D? It is considered one of the fat soluble vitamins. It is produced when the skin is exposed to the sun, from certain foods, or as a dietary supplement, and it is biologically inert. That is, it must be activated in the...
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How important is the lungs? The importance of the lungs lies in the body obtaining the oxygen that is important for survival, and ridding the body of carbon dioxide gas. The lungs transport oxygen to the blood stream that carries it to all parts of...
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Introduction Viruses have a very ancient history since their discovery and are numerous and varied. Viruses spread in many ways, and many viruses are very specific to the host species or tissues that attack them. Each type of virus depends on a specific method of...
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