Question

Explain double circulation in humans.

Answer 1

Hint: In humans oxygenated blood from the heart is pumped to different parts of the body and the deoxygenated blood is collected and sent to the lungs.

Complete answer:
The circulatory system in humans is an important system of circulation and transportation of various nutrients and oxygen needed to carry out different biological processes in the cells of the body. The circulatory system also works to eliminate different toxic or waste products that are produced due to metabolic activities.
The heart and the lungs together work to play an important role in the process of circulation and removal of waste materials from the blood circulation. In most of the animals, the circulation process is of two types, single circulation and double circulation. In single circulation, blood is passed through the heart to the gills and the blood is purified. The purified blood is then distributed to different parts of the body.
In double circulation, the heart plays an effective role and the process of circulation serves to be an efficient way of purification of blood. In this process, the blood flows in two different routes, one route is for the oxygenated blood while the other one is for deoxygenated blood. Thus, the circulation is known as double circulation.
The heart is the prime organ for blood circulation in humans as it distributes oxygen rich and is divided into four chambers, namely, left atria, right atria, left ventricles and the right ventricles. The heart is connected with the lungs through the pulmonary artery and veins.
The process of double circulation follows two pathways, which are the systemic and pulmonary circulation.
In systemic circulation, oxygen rich blood is carried from left ventricles to the tissues. The aorta receives the oxygenated blood and distributes it to different parts of the body. The deoxygenated blood is collected by the veins and is carried to the superior vena cava into the atrium. The atrium carries the blood to the right ventricle for pulmonary circulation.
In the pulmonary circulation, the pulmonary artery collects the blood and carries it to the lungs. In the lungs, the deoxygenated blood is purified and oxygenated blood is pumped back to the left atrium and carried to the left ventricles. The left ventricles then pump the blood to the aorta for further circulation.

Note: The double circulation process includes both the heart and the lungs and follows a strict distinct separation of the two types of blood. This type of circulation ensures a flow of oxygenated blood to different parts of the body and efficient removal of waste materials from the deoxygenated blood.