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.
Did you know?
Your heart beats over 36 million times a year.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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The human body produces and destroys 15 million blood cells every second.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Heart
Gross anatomy of the heart
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In crocodilians, birds, and mammals, the heart has four chambers: two atria and two ventricles. Oxyg