Systems in the body interact to carry out life functions. The muscles of the body are part of the muscular system. Which system provides the impulses that cause the muscles to contract?

Which term defines one's age as measured by how well the body is working? chronological age biological age social age mental age

Which plan groups foods according to types and indicates how much of each type should be eaten daily for a healthy diet? a.mypyramid plan b.food guide pyramid plan c.dietary guidelines for americans d.dietary pyramid guidelines

Which of these is most likely to prevent pregnancy? a. tracking of female body temperature to identify ovulation times b. proper condom use c. male withdrawal before ejaculation d. proper spermicide use