The physiology of the human body works like a single, intricate machine with one part affecting the whole. In like manner, every single condition that the human body experience has an effect to another system and its function. This idea can be further explained by studying the conditional effect of some of the cardio-pulmonary system with the nervous system, the kidney and the adrenal glands and vice versa.

One of the best examples of this idea is the heart rate. It is an obvious fact that the heart rate of the person can be influence by certain emotional factor determined by the nervous system. Feeling of fear is known to drastically increase the heart rate of an individual thus emphasizing the direct correlation between the two. Also, the adrenal glands and their secreted hormones can also influence the heart rate of an individual such as the effects of adrenaline to the heart rate and others. In like manner, the peripheral resistance, venous return, stroke volume, blood viscosity, cardiac output and end systolic and diastolic volumes are also affected by the conditions of the nervous system and the adrenal glands. During moments where there are intense emotions and need for survival arises, the nervous system drastically increase most of the cardio-pulmonary condition such as the ones mentioned to increase oxygen intake and body reaction to cope up with the situation. In like manner, the hormones of the adrenal glands also drastically hasten up the functions of the said system to intensely increase the energy availability and body abilities. For needs to regulate the blood pressure, the kidney significantly influence the said cardio-pulmonary system to maintain the normal pressure and stabilize the body function during adverse situation.

From this system reactions and cooperative involvement of the major physiological organization of the body organs, the