Double Circulation

The whole circulation system in humans starts from the human heart, called the blood vascular system, consisting of a muscular chambered heart, a network of closed branched blood vessels and blood, and circulated fluid. The heart is located in the thoracic cavity, between the two lungs, just leaning to the left. The heart has four chambers, two moderately small upper chambers named atria and two bigger lower chambers called ventricles. What is double circulation?

It is two different circulations, and blood departs through the heart twice, which is called 

1. The pulmonary circuit between the heart and lungs.

2. The systemic circulation; is between the heart and the other organs.

Double Circulation

The majority of mammals (including humans) utilize a double circulatory system. This means that we have two loops in our body in which blood circulates. One is oxygenated, meaning oxygen-rich, and the other is deoxygenated, which means it has little to no oxygen, but a lot of carbon dioxide. Double circulatory systems in humans are important because they ensure that we give our tissues and muscles blood full of oxygen instead of a mixture of oxygenated and deoxygenated blood. While it may take a bit more energy than a single circulatory system, this system is much more efficient! The organ that powers the circulatory system is the heart. The human heart pumps blood through four chambers: two atria and two ventricles. We also have four valves in our hearts that keep blood moving in one direction, preventing backflow back into the heart; two valves are found within the heart itself, and two are found in the major arteries in the heart: the aorta and the pulmonary artery. The deoxygenated blood plugs down from the right atrium to the right ventricle. The heart then pumps it out of the right ventricle and into the pulmonary arteries to begin pulmonary circulation. The blood carries to the lungs, dealings carbon dioxide for oxygen, and back to the left atrium. The oxygenated blood plugs from the left atrium to the left ventricle down to start systemic circulation again. 

Pulmonary circulation and Systemic circulation

Pulmonary circulation carries blood to the heart and the lungs. It takes deoxygenated blood to the lungs to take in oxygen and remove carbon dioxide. The oxygenated blood then gets back to the heart. Systemic circulation carries blood between the heart and the rest of the body. It takes the oxygenated blood out to cells and gives back deoxygenated blood to the heart.

Pulmonary circulation Only carries Blood Between the Heart and Lungs.

In the pulmonary circulation, deoxygenated blood leaves the heart’s right ventricle and goes through the pulmonary compartment. The pulmonary compartment divides into the right and left pulmonary arteries. These arteries carry the deoxygenated blood to arterioles and capillary beds in the lungs. There, carbon dioxide is emitted, and oxygen is soaked. Oxygenated blood then goes from the capillary beds through venules into the pulmonary veins. The pulmonary veins carry it to the left atrium of the heart. The pulmonary arteries are the only arteries that transport deoxygenated blood, and the pulmonary veins are the only veins that transport oxygenated blood. 

Systemic circulation travels all over the body

The systemic circulation, oxygenated blood is taken from the heart’s left ventricle through the aorta, the biggest artery in the body. The blood travels from the aorta through the systemic arteries, then to arterioles and capillary beds that provide body tissues. Here, oxygen and nutrients are emitted, and carbon dioxide and other waste substances are absorbed. Deoxygenated blood then travels from the capillary beds through venules into the systemic veins. The systemic veins provide the inferior and superior venae cavae, the biggest veins in the body. The venae cavae takes deoxygenated blood to the right atrium of the heart.

Fun facts about the circulatory system

• The circulatory system in humans is quite long- If we were to spread out all of the arteries, capillaries and veins in humans, they would extend about 100,000 kilometres. What’s more interesting is; that the capillaries, which are the smallest of the blood vessels, can make up about 80 per cent of this length.

• Physicians observed a wrong model of the circulatory system for 1500 years- In the 2nd century, the Greek physician and philosopher Galen of Pergamon came up with a reasonable model for the circulatory system. He rightly realized that the system involves dark red and bright red blood, and the two types have different functions. Nevertheless, he also suggested that the circulatory system consists of two one-way systems of blood diffusion (rather than a single) and that the liver produces venous (dark blood) that the body ingests. He also believed the heart was a sucking organ instead than a pumping one. Galen’s theory reigned in Western medicine until the 1600s when English physician William Henry accurately defined blood circulation.

Conclusion

It is two separate circulations, and blood departs through the heart twice, and circulation is called the pulmonary circuit between the heart and lungs. The systemic circulation; is between the heart and the other organs. In the pulmonary circulation, deoxygenated blood leaves the heart’s right ventricle and goes through the pulmonary compartment. The systemic circulation, oxygenated blood is taken from the heart’s left ventricle through the aorta, the biggest artery in the body. Double circulatory systems in humans are important because they ensure that we give our tissues and muscles blood full of oxygen instead of a mixture of oxygenated and deoxygenated blood.