During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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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.
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Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.