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Did you know?

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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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

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Colchicine is a highly poisonous alkaloid originally extracted from a type of saffron plant that is used mainly to treat gout.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

Atom Structure Atom Structure
Atom Atom
Outer Wall of The Flavian Amphitheater (Colosseum) Outer Wall of The Flavian Amphitheater (Colosseum)
A uniform solid cylinder of radius R and a thin uniform spherical shell of radius R both roll ... A uniform solid cylinder of radius R and a thin uniform spherical shell of radius R both roll ...
An Atom An Atom
Bivalve (scallop) with hinged, two-part shell Bivalve (scallop) with hinged, two-part shell
Video: Wound Repair Animation

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