When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
Upward transport of water in xylem.
Electron micrograph of phage T4
Electron Microscope
Reverse Cholesterol Transport Pathway
Overview of lipoprotein transport pathways and fates
An electron micrograph and an interpretive drawing of the hybrid molecule