Describe the flown of blood through the heart of human beings.

Explanation

The human circulatory system is maintained by the cardiovascular system to transport the blood containing hormone, oxygen, salt, nutrients and collect cellular wastes throughout the body. The heart is the key organ of cardiovascular system, which acts as a muscular pump. It is organized with a set of arteries and blood vessels which regulates the blood flow systematically. The following flow chart shows the circulation of blood through the heart :

The blood from the systemic circulation comes to the left auricle through pulmonary vein. From left auricle, the blood is pumped into the left ventricle. Finally, the left ventricle pumps the blood into the systemic circulation.
In our body two types of circulatory system completes together the whole cardiovascular system.
(i) First is the transport of blood for the exchange of gases (Oxygen and carbon dioxide) which includes the connection of heart to lungs.
(ii) Second, includes the transport and distribution of oxygenated blood from heart to all the other body parts.
The complete separation of oxygenated and deoxygenated blood is done due to the presence of atrio-ventricular valves that regulates the maintenance of oxygen content.
Refer diagram from Q.3.