There are 20 feet of blood vessels in each square inch of human skin.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.
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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
Countercurrent heat exchange in the lateral muscles of bluefin tuna.
Bacteria exchange DNA by several processes
Collage of Student Faces
Schematic representation of MHC class I molecule, consisting of 3 α domains and 1 β2-microglobulin ...
A heat exchange vest that uses ice packs for cooling