Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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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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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
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The human body produces and destroys 15 million blood cells every second.
The respiratory system: nasal cavity, pharynx, larynx, trachea, bronchus, and lung with expanded vie
Primary visual processing areas (blue) in (a) human (lateral and mesial views) and (b) chimpanzee.
In 1891 William Dean Howells championed the poetry of Emily Dickinson: “This poetry is as characteri
The reference electrodes are shared by the Nernst cell and the pump cell.