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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

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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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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

Hartmann's mountain zebra resting, showing its characteristic essentially unbarred belly Hartmann's mountain zebra resting, showing its characteristic essentially unbarred belly
Characteristic Patterns of Murmurs, Crescendo, Decrescendo, Crescendo-decrescendo, Plateau Characteristic Patterns of Murmurs, Crescendo, Decrescendo, Crescendo-decrescendo, Plateau
Emphysema. (a) Illustration comparing normal lungs and emphysemic lungs. The inserts illustrate how Emphysema. (a) Illustration comparing normal lungs and emphysemic lungs. The inserts illustrate how
The hand on the right exhibits the orange-tinged skin characteristic of carotenodermia The hand on the right exhibits the orange-tinged skin characteristic of carotenodermia
Chromatin fibers characteristic of the interphase nucleus Chromatin fibers characteristic of the interphase nucleus
Video: Rena arc construction

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