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Did you know?

Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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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 pH-activity profiles of two enzymes The pH-activity profiles of two enzymes
First-pass effect: (a) drugs are absorbed; (b) drugs enter hepatic portal circulation and go directl First-pass effect: (a) drugs are absorbed; (b) drugs enter hepatic portal circulation and go directl
Two enzymes, enoyl-CoA isomerase and 2,4-dienoyl-CoA reductase Two enzymes, enoyl-CoA isomerase and 2,4-dienoyl-CoA reductase
An Enzyme in Action Enzymes speed up reactions in your body An Enzyme in Action Enzymes speed up reactions in your body
Enzymes Enzymes
Video: Protein digestion - stomach & small intestine

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