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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.
![Phlebotomy. In this common procedure, a syringe needle punctures a vein, usually in the arm, and wit](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_15_46_100322221.jpeg)
![Common skin signs are often evidence of an illness or disorder. A macule is a discolored spot on the ...](https://biology-forums.com/gallery/47/medium_665046_01_03_17_6_26_23_26130687.jpeg)