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Author Question: The ________ is responsible for initiating the heartbeat. a. SA node b. AV node c. sinoatrial ... (Read 166 times) |
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Illicit drug use costs the United States approximately $181 billion every year.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.
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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.