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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.
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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.