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Homeostasis Homeostasis works to maintain the organism's internal environment, where the body's processes are able to function at a level that would allow life to continue in that organism. The three systems which are controlled by homeostasis are the respiratory, cardiovascular, and muscular systems. Changes to the cardiovascular system are often a result of changes in the activities of other systems. The heart rate, the cardiac output and the blood pressure change to different degrees of bodily activity. The heart rate slows and cardiac output falls when demands on bodily systems are less high. However the opposite is true when demands on the bodily systems are high, the heart rate increases and also the cardiac output also increases. Breathing is essential to life: it allows oxygen to be taken in and carbon dioxide to be given off. Processing food in order to obtain the energy needed for a wide range of activities is...

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