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Did you know?
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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To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
![Illustration showing how the primary breast tumor metastasized through the lymphatic and blood vesse](https://biology-forums.com/gallery/47/medium_14755_27_08_12_12_17_41_8191646.jpeg)
![Lymphatic vessels (green) pick up excess tissue fluid, purify it in lymph nodes, and return it to th](https://biology-forums.com/gallery/47/medium_14755_10_09_12_7_17_45_85032206.jpeg)