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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
![(A) Each bronchiole terminates in an alveolar sac, a group of alveoli; (B) alveoli encased by networ](https://biology-forums.com/gallery/47/medium_14755_10_09_12_7_13_31_84891921.jpeg)
![A vacuum-operated EGR valve. The vacuum to the EGR valve is computer controlled by the EGR valve ...](https://biology-forums.com/gallery/30/medium_548020_01_06_17_5_17_19_30116996.png)