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The human body produces and destroys 15 million blood cells every second.
The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.