If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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People about to have surgery must tell their health care providers about all supplements they take.
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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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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
reaction system of photosynthesis
An overview of the arterial system.
Procedures and Diagnostic Tests Related to the Integumentary System
A point-type ignition system showing the distributor cam which opens the points