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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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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.