The heart is a muscular organ composed of specialized muscles called cardiac muscles. The main function of the human heart is to pump blood to various parts of the body. There are several internal factors which enable the human heart to regulate its activities on its own, but there are some external influences as well which regulate cardiac activity. These factors include an autonomic nervous system, chemicals like hormones, ions etc. Let us start our discussion with the cardiac cycle. The Atrial Natriuretic factor (ANF) is released when there is an increase in blood flow to the atria of the heart . It causes vasodilation and decreases blood pressure in the blood vessels. The ANF mechanism provides the necessary check to the Renin-Angiotensin mechanism. To learn more about kidney function or other biology articles, visit BYJU’S. Human Heart The heart is a muscular organ that is situated in the front of the chest. It pumps blood all through the body in a process called circulation. Apart from the heart , the blood vessels and blood as a unit constitute the cardiovascular system. Heart , blood and a network of arteries, veins, and other blood vessels make the cardiovascular system. The heart is the key structure of a circulatory system because it is the motor or pumping organ which helps in circulation of blood throughout the body as per requirement.
