Physical activity is any bodily movement produced by skeletal muscles that requires energy expenditure
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The agency monitors the need for vaccinations for infectios disease is the Center for Disease Control or CDC
C. Median toxicity.
Explanation – The frequency of drugs are given based on its toxicity or the side effects in the body. All drugs have certain half-life in which there action is maximum and after that the drug is removed through the urine primarily.
Different people react differently to a drug and hence the doctors prescribe the anti-tablets for the side effects occurring. The drug for cold is prescribed after four hours because its effect gets reduced and has to be removed from the body.
I think the answer is nervous system and muscular system work together but i could be wrong.
