Physical activity is an inclusive term that refers to any expenditure of energy brought about by bodily movement via the skeleta
l muscles; as such, it includes the complete spectrum of activity from very low resting levels to maximal exertion. Exercise is a component of physical activity. The distinguishing characteristic of exercise is that it is a structured activity specifically planned to develop and maintain physical fitness. "exercise." Britannica School. Encyclopaedia Britannica, Inc., 2013. Web. 21 Oct. 2013.
How is the word expenditure used in this excerpt?
A. To show the type of activities completed by skeletal muscles
B. To identify how much energy is used at low resting levels
C. To describe the amount of movement required for maximal exertion
D. To highlight that a physical activity requires a body to use energy
D. To highlight that a physical activity requires a body to use energy
The word expenditure in the excerpt is simply stating that the body uses energy during physical activity. It doesn't describe how much energy since that can be different depending on the level of physical activity. Because it doesn't include how much, options B and C are both wrong. Also, expenditure is not a type of activity, so this also eliminates A.
