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.
Did you know?
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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Your heart beats over 36 million times a year.
The lymphatic system in humans.
Conduction System of the Heart
Procedures and Diagnostic Tests Related to the Urinary System
Conduction system of the heart.
Earth’s Climate System
Pathway by which the nervous system controls skeletal muscle contraction