Skip to content
Related Articles
Get the best out of our app
Open App

Related Articles

Double Circulation

Improve Article
Save Article
Like Article
Improve Article
Save Article
Like Article

Body fluids are a variety of liquids that are found throughout the body. Such liquids typically either leave the body through excretion or circulate there. The cardiovascular system of the human body, as well as bodily fluids, are crucial. Together, they act as a conduit for the movement of vital chemicals such as oxygen, nutrition, hormones, and others. Nutrition, oxygen, and other necessary materials must be given to all living cells. Additionally, continual removal of waste or dangerous chemicals is necessary for the healthy operation of tissues. Therefore, having effective systems in place for the migration of these materials into and out of cells. 

Different strategies for this conveyance have evolved in various animal groupings. Simple water is circulated by organisms like sponges and coelenterates. environment through their bodily canals, allowing the interchange of cells with these ingredients. More advanced organisms employ specific bodily fluids to convey these substances. Most higher organisms, including humans, use blood the most frequently for this purpose. Lymph, another bodily fluid, also aids in the transportation of some chemicals.

You will discover the constitution and characteristics in this chapter lymph (tissue fluid), blood, and the mechanics of blood circulation is additionally described here.

Double Circulation

Transport of nutrients and oxygen,  the body, and excretory products out of the body are all handled by the circulatory system. A significant part of the body’s blood circulation and purification process is performed by the heart and lungs.

Different Circulatory System 

Animal’s circulatory systems come in two ways: open circulatory systems and closed circulatory systems. Most mammals, including people, have two circulatory systems. According to the number of times blood circulates through the heart, therefore closed  system circulation  would be  divided into two groups:

Single circulation

Blood circulates through the heart and gills in a single circulatory system before being purified and delivered to various bodily areas. Single circulation refers to a condition in which just one heart cycle is completed. For instance, solitary circulation is most common in fish, reptiles, and birds.

Double Circulation

Double Circulation


The circulation which is double would be an effective method of circulation because it offers an effective method of circulation. The heart is the primary organ for blood circulation. The primary distinction is that the blood travels along two different paths—one for blood that would be oxygenated and another for deoxygenated blood. Thus, “double circulation” was coined. Most mammals, including humans, have two circulatory systems.

The human heart would be divided into four chambers two for atria which would be on right and left vice versa for ventricles which would be right and left.

Pulmonary circulation

  • The left ventricles send oxygenated blood to capillaries via systemic circulation.
  • The aorta receives the oxygen-rich blood before distributing it to various body areas.
  • The deoxygenated blood, which is high in carbon dioxide, is later collected from various sections of the body through veins and venules.
  • Reoxygenated blood is pushed back into the right atrium and subsequently into the vena cava which is superior.
  • The right ventricle would receive blood from the right atrium for circulation i.e, pulmonary circulation after receiving the deoxygenated blood.

Systemic Circulation

Blood circulates from the atrium which is on right to the atrium on the left in the pulmonary circulation. Along this path:

  • The right ventricle’s blood is collected by the pulmonary artery and sent to the lungs for oxygenation.
  • The oxygenated blood is pushed to the atrium present on the left side following the purification process through the pulmonary vein, which is transported to the left ventricles.
  • The oxygenated blood is pumped from the left ventricles to the aorta for circulation which would be systemic.
  • The rigorous separation of deoxygenated blood and oxygenated blood would be supported by double circulation. Therefore always a certain amount of Oxygen would be supplied to the body this circulation also increases bodily efficiency. In part because of this, mammals are able to regulate their body temperatures. A third portal system exists in addition to the double circulation to increase circulation effectiveness.

Through blood vessels—the arteries and veins—the blood travels rigidly along a predetermined path. 

Each artery and vein is primarily composed of 3 layers: the tunica intima, the intermediate layer, and the squamous endothelium inner layer, the tunica media, a layer containing elastin and smooth muscle, and the tunica is an outer layer of collagen-rich connective tissue that is fibrous, the veins in the tunica medium are quite narrow.

As previously stated, the right ventricle pumps blood into the body the left ventricle pushes blood into the pulmonary artery, while the aorta. The blood that is pushed into the pulmonary artery is deoxygenated from the heart, where the O2 is delivered, and then to the lungs, the left atrium from the pulmonary veins. This route makes up the pulmonary circulation.

A combination of arteries, arterioles, and capillaries transport the oxygenated blood from the aorta to the tissues, where a system of venules collects the deoxygenated blood. Vena cava and veins are discharged into the right side of the heart. That’s the systemic system. 

The systemic circulatory system offers vitamins, oxygen delivers additional crucial elements to the tissues, and it takes CO2 and other dangerous substances out of the way for removal. a distinct The hepatic portal system is the circulatory link between the liver and the digestive system. Blood from the intestine is carried by the hepatic portal vein. before it is given to the systemic circulation, to the liver. a unique coronary scheme of the vascular system is existent in our body exclusively for the flow of blood to and through.

FAQs on Double Circulation

Question 1: Why double circulation is necessary?


Blood is circulated twice, which helps maintain oxygenated blood and deoxygenated blood separate (blood rich in carbon dioxide). Because more o2 blood can be transported to the tissues thanks to this, the blood supply is improved, and the body’s temperature is kept steady.

Question 2: Why single circulation is seen in birds?


 In the case of mammals and birds, the left and right atria, respectively, receive the deoxygenated blood and the oxygenated blood that is then transferred to the corresponding sides’ ventricles. In this system, there is no intermixing of the blood deoxygenated and the blood oxygenated.

Question 3: What is the use of pulmonary circulation?


Pulmonary circulation would change the deoxygenated blood into oxygenated blood which then passes to the ventricles of the left side to supply the body parts.

Question 4: How the tissues would be perfused?


With the help of systemic circulation, the oxygenated blood from the lungs then transmit the oxygenated blood to the tissues and the tissues would be perfused with adequate oxygen and nutrients.

Question 5: What are the advantages of double circulation?


  • It supports increased blood pressure maintenance.
  • It permits more blood to flow to the tissues.
  • More pressure is created, which aids in pumping blood throughout the body’s tissues and organs.
  • It is feasible for oxygenated blood to be separated from deoxygenated blood, which would allow for the inhalation of oxygen-rich blood and the elimination of co2 from  the blood by the lungs.
  • It assists in generating a significant quantity of energy needed to support living processes.

Question 6: What is the function of elastin for the blood vessels of the heart?


Elastin is an important structural and regulating matrix protein that performs a significant and dominant function in elastic and muscular arteries by giving the arterial wall elasticity. The activity and phenotypic of vascular endothelium are likewise regulated by elastin.

My Personal Notes arrow_drop_up
Last Updated : 04 Sep, 2022
Like Article
Save Article
Similar Reads
Related Tutorials