They Protect Us From Risk
If organ systems failed to work together your body would not work because your heart pumps blood in order for your whole body to work.
<span>By testing roles and integrating them into a single identity</span>
It’s important because your heart must beat faster during exercising because the increase of the heart rate also will need a increase of cardiac output to deliver the necessary blood flow to the muscles.
Hope this help
D I am guessing is the most correct.
