What is the main function of the human heart? Just say it roughly. Tell me the simplest thing. Thank you. Also in the following

The function of the heart is to pump blood, or circulate blood, which enters all parts of the body through blood vessels. Blood provides nutrition and oxygen for the body. All cells need oxygen to survive.

Blood vessels are divided into arteries and veins. Arteries carry oxygen-enriched blood. Aorta is the largest artery in human body. Arteries, like branches, originate from the aorta and reach all parts of the body, providing them with oxygen-enriched blood.

Intravenous transport cells use hypoxic or deoxygenated blood. Hypoxic blood flows from venules to the largest veins, superior vena cava and inferior vena cava. Veins transport oxygen-deficient blood back to the right heart, and then replenish oxygen through pulmonary circulation.

The heart beats 60- 100 times per minute for a lifetime. This contraction is stimulated and controlled by the natural pacing point of the heart. After the current starts, the left and right atria contract at the same time, and then the left and right ventricles contract at the same time. This synchronous electrical stimulation causes the heart to pump blood and circulate blood. This blood flow can be felt by your pulse. The electrical activity of the heart when pumping blood can also be recorded by ECG.