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The familiar sounds of your heart are made by the heart's valves as they open and close.

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Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.

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The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.

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People about to have surgery must tell their health care providers about all supplements they take.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

Some organisms used as models in genetic research Some organisms used as models in genetic research
The catabolism of various molecules from food. The catabolism of various molecules from food.
Steps in protein synthesis: The DNA is used as a template to make mRNA (transcription). The mRNA is ... Steps in protein synthesis: The DNA is used as a template to make mRNA (transcription). The mRNA is ...
Mix Up Your Choices within Each Food Group Mix Up Your Choices within Each Food Group
Chewing & Swallowing: Food Processing Begins Chewing & Swallowing: Food Processing Begins
How to impress a choosy female: Male Hangingfly Bearing Food How to impress a choosy female: Male Hangingfly Bearing Food
Video: Inflammation Animation

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