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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

Internal view of the heart illustrating the heart chambers, heart layers, and major blood vessels as Internal view of the heart illustrating the heart chambers, heart layers, and major blood vessels as
Cystoscopy. In this procedure, a specialized endoscope with a rigid tube, known as a cystoscope, is Cystoscopy. In this procedure, a specialized endoscope with a rigid tube, known as a cystoscope, is
The heme group viewed from the side. This view shows the two coordination bonds to Fe2+ The heme group viewed from the side. This view shows the two coordination bonds to Fe2+
The major skeletal muscles—posterior superficial view. The major skeletal muscles—posterior superficial view.
Dermatomes of body, posterior view Dermatomes of body, posterior view
Video: What is Cholesterols? Introduction to Lipoproteins

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