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Heart rate depends on several factors such as hormonal, neurogenic, physical activity, blockage or stenosis in the vessels, body temperature etc. In fact, anything which affects the homeostatic balance of the body will have some effect on the heart rate. If the body is cold, the rate will increase to drive more heat in the blood to the places where it can sustain the life of the organism. If there is blood loss or severe hemorrhage, the rate will increase to send life saving blood to those places to sustain life. Increase in the heart rate is generally called sinus tachycardia. Decrease in the rate is called- Bradycardia. If there is blockage or stenosis the rate will also increase. rapid exercise or exertion will also cause increase. The hormone adrenalin from the adrenal glands will also speed up the rate. Bood circulation is the vital way that life is sustained in the organism. Cessation of blood flow will cause lack of oxygenated blood to the vital organs and will result in death first to the heart muscle and then to the brain. Oxygenated blood from the heart goes first to the heart muscle, then to the rest of the body. I have put all this complex human physiology in its simplistic form for all to understand. I am Ras cardo reggae( Ricardo Scott) and am here to help.

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