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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
In women, pharmacodynamic differences include increased sensitivity to (and increased effectiveness of) beta-blockers, opioids, selective serotonin reuptake inhibitors, and typical antipsychotics.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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.