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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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
The segmented body plan of an annelid, as illustrated by an earthworm.
