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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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.
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.