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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.
Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.

