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Did you know?

The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

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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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Fatal fungal infections may be able to resist newer antifungal drugs. Globally, fungal infections are often fatal due to the lack of access to multiple antifungals, which may be required to be utilized in combination. Single antifungals may not be enough to stop a fungal infection from causing the death of a patient.

Cell-wall structure of Gram-positive and Gram-negative bacteria. Cell-wall structure of Gram-positive and Gram-negative bacteria.
Gram-positive and Gram-negative bacteria. Gram-positive and Gram-negative bacteria.
An analogy for how cardiac output, resistance, and blood pressure are related. An analogy for how cardiac output, resistance, and blood pressure are related.
Drug Resistance Drug Resistance
Gram negative N. gonorrhoeae. Gram negative N. gonorrhoeae.
Control of thyroxine secretion through negative feedback. Control of thyroxine secretion through negative feedback.
Video: Major Elements in Biological Molecules: Lipids

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