Homeostasis

Homeostasis is responding to changes in the conditions of the external environment and the internal environment. Homeostasis works to maintain the organism's internal environment within tolerance limits; the range of conditions where the body's processes are able to function at a level that would allow life to continue in that organism. The respiratory, cardiovascular, and muscular systems are all controlled by homeostasis.
Changes in the activities of the cardiovascular system are often a result of changes in the activities of other systems. …