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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

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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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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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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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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.

ABO Blood Reactions Are Important in Transfusions ABO Blood Reactions Are Important in Transfusions
The process of placing a stent in a blood vessel. (A) A catheter is used to place a collapsed stent The process of placing a stent in a blood vessel. (A) A catheter is used to place a collapsed stent
The lymphatic system. Lymphatic vessels, major lymph nodes, and lymphatic organs. The direction of l The lymphatic system. Lymphatic vessels, major lymph nodes, and lymphatic organs. The direction of l
The flow of blood valves of the heart. The flow of blood valves of the heart.
Blood pressure is controlled by the cardiovascular and kidney systems Blood pressure is controlled by the cardiovascular and kidney systems
The heart and its major blood vessels. Oxygen-rich blood is pumped from the lungs to the left The heart and its major blood vessels. Oxygen-rich blood is pumped from the lungs to the left
Video: Muscular Dystrophy

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