what is double circulation ? class 10 cbse....
Answers
The circulatory system is responsible for the transportation of nutrients and gases like oxygen, to the body and metabolic waste products away from the body. The heart and the lungs play an important role in circulating and purification of blood throughout the body.
Types of Circulatory Systems
In animals, there are two types of circulatory systems: open circulatory system and closed circulatory system. The majority of mammals, including humans use a double circulatory system. The closed circulatory system is further classified into two, based on the number of times blood circulation takes place through heart:
Single Circulation
In single circulatory system, the blood will pass through the heart to gills, then after purification, blood will be distributed to different parts of the body. Only one cardiac cycle is completed, hence the name single circulation. For example: single circulation is mainly seen in birds, fish, reptiles, etc.
Double Circulation
The heart is the key organ for blood circulation and the double circulation is an efficient way of circulation as it provides an effective way of circulation. The main difference is that the blood follows two routes – one for oxygenated blood and the other for deoxygenated blood. Hence the name “double circulation.” The majority of mammals, including humans utilize double circulatory system.
The human heart is divided into four chambers:
Left Atria
Right Atria
Left Ventricles
Right Ventricles
Further, the heart is connected to the lungs through the pulmonary artery and vein. In double circulation, there are two pathways in which the blood flows. They are:
Systemic circulation
In the systemic circulation, the blood circulation starts from the left atrium of the heart to the left ventricle of the heart. In this pathway:
The oxygen-rich blood is transferred to the aorta for circulating into various parts of the body.
Later, the veins and venules collect the deoxygenated blood – which is rich in carbon dioxide from various parts of the body.
The deoxygenated blood is pumped back into the superior vena cava and then to the right atrium.
Once after receiving the deoxygenated blood, the right atrium carries blood to the right ventricle for pulmonary circulation.
Pulmonary circulation
In the pulmonary circulation, the blood circulation starts from the right atrium to the left atrium. In this pathway:
The pulmonary artery collects the blood from the right ventricle and carries to lungs for oxygenation.
Once after the purification process, the oxygenated blood is pumped back to the left atrium through the pulmonary vein which is carried to the left ventricles.
The left ventricles pump the oxygenated blood to the aorta for systemic circulation.
Double circulation supports a strict separation of both oxygenated and deoxygenated blood. Therefore, this circulation ensures that the body always has a dedicated supply of oxygen and also, it improves the body efficiency. This is also one of the reasons why mammals can maintain their body temperatures. Apart from the double circulation, a third portal system also exists to improve the circulation efficiency.
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Double Circulatory System
The human circulatory system has three key components: blood vessels, blood and the heart. It is called a double circulatory system because blood passes through the heart twice per circuit.
The right pump sends deoxygenated blood to the lungs where it becomes oxygenated and returns back to the heart.
The left pump sends the newly oxygenated blood around the body. By the time this blood returns to the heart, it has returned to a deoxygenated state.
Blood Passes Through The Heart Twice Per Circuit
Blood enters the heart
Deoxygenated blood from the body enters into the right atrium of the heart.
Blood pumped to lungs
This deoxygenated blood is pumped out of the heart and towards the lungs by the right ventricle.
Lungs oxygenate the blood
At the lungs, the deoxygenated blood exchanges carbon dioxide for oxygen. This is how it becomes oxygenated (contains oxygen).
Blood returns to the heart
Oxygenated blood returns to the left atrium of the heart.
Blood pumped to the body
This oxygenated blood is pumped out of the heart and to the body by the left ventricle.
Blood returns to the heart
The oxygenated blood gives its oxygen to body cells in exchange for carbon dioxide. The blood becomes deoxygenated and returns to the heart.