Medicine

Difference Between Pulmonary Circulation and Systemic Circulation

Main difference

The main difference between pulmonary circulation and systemic circulation is that pulmonary circulation is the transport of deoxygenated blood from the heart to the lungs and back to the heart and systemic circulation is the transport of oxygenated blood from the heart to the body and back. vice versa. to the heart.

Pulmonary circulation versus systemic circulation

Pulmonary circulation is the transport of deoxygenated blood from the heart to the lungs and after oxygenation in the lungs back to the heart, while the systemic circulation is the transport of oxygenated blood from the heart to the body and returning deoxygenated blood from the heart. body to heart In the pulmonary circulation, deoxygenated blood from the right ventricle is pumped to the lungs through the pulmonary arteries, while in the systemic circulation, oxygenated blood from the lungs enters the left ventricle through the pulmonary veins. The pulmonary circulation is a lower pressure system, while the systemic circulation is a higher pressure system. The pulmonary circulation involves pulmonary valves. On the other hand, the systemic circulation involves aortic valves.

Comparison chart

Pulmonary circulation systemic circulation
Pulmonary circulation is the transport of deoxygenated blood from the heart to the lungs and after oxygenation in the lungs back to the heart. Systemic circulation is the transport of oxygenated blood from the heart to the body and the return of deoxygenated blood from the body to the heart.
circulation route
From the right ventricle to the lungs. From the lungs to the left ventricle.
blood vessels involved
Pulmonary arteries pulmonary veins
valves involved
pulmonary valves aortic valves

Pressure difference

The pulmonary circulation is a low pressure system. The systemic circulation is a high pressure system.
main role
blood oxygenation Supply of oxygen and nutrients to the body and collection of waste products and gases.

What is the pulmonary circulation?

Pulmonary circulation is the transport of deoxygenated blood from the heart to the lungs for resaturation of the blood with oxygen before entering the systemic circulation. The pulmonary circulatory system is the only pathway through which full cardiac output passes. The main role of the pulmonary circulation is that it allows the exchange of respiratory gases. The pulmonary circulation is a high-flow, low-pressure system that plays the role of respiratory gas exchange. The right atrium of the heart receives deoxygenated blood from the lower half of the body through the inferior vena cava, and deoxygenated blood from the upper half of the body is received through the superior vena cava. The right ventricle receives blood from the right atrium through the tricuspid valve. Blood from the right ventricle flows into the pulmonary artery through the pulmonary valve before reaching the lungs. Within the lungs, blood moves into the many pulmonary capillaries, releasing carbon dioxide and replenishing itself with oxygen. When the blood is fully saturated with oxygen, it is transported through the pulmonary vein to the left atrium. The right atrium pumps blood through the mitral valve into the left ventricle. Then, the pulmonary circulation conducts all cardiac output from the pulmonary artery with a significantly low driving pressure with a mean Ppa of 15 to 20 mm Hg to the right atrium which has a Plan of 7-12 mm Hg. In the pulmonary circulation,

What is the systemic circulation?

Systemic circulation is the circulation of blood, which carries oxygenated blood from the heart to the body and returns deoxygenated blood from the body to the heart. Blood from the left ventricles is pumped through the aorta and arterial branches to the arterioles. The capillaries then take in blood, and the capillaries drain into the veins through the venules. The blood returns through the venae cavae to the right atrium of the heart. The carotid arteries branch off from the aorta. Some arteries branch from the aortic arch, for example, the brachiocephalic, left common carotid, and left subclavian arteries. The internal carotid and vertebral arteries carry the blood supply to the brain. The subclavian arteries supply blood to the upper extremity. Some arteries branch from the abdominal aorta and supply blood to the abdominal viscera. The lumbar arteries supply blood to the spinal cord and muscles. The external iliac artery branches off and supplies blood to the lower extremity. The internal iliac artery supplies blood to the pelvic viscera. The pressure of the arterial system is responsible for maintaining systemic blood flow. The systemic pathway is made up of many circuits, and each circuit has its own arteriolar resistance. Each circuit determines blood flow, which is independent of overall flow and pressure, eg blood flow to muscles increases during exercise. and each circuit has its own arteriolar resistance. Each circuit determines the blood flow, which is independent of the general flow and pressure, for example, blood flow to the muscles increases during exercise. and each circuit has its own arteriolar resistance. Each circuit determines blood flow, which is independent of overall flow and pressure, eg blood flow to muscles increases during exercise.

Key differences

  1. Pulmonary circulation is the transport of deoxygenated blood from the heart to the lungs and after oxygenation in the lungs back to the heart, while systemic circulation is the transport of oxygenated blood from the heart to the body and returning deoxygenated blood from the heart. body to heart
  2. Pulmonary circulation involves the transport of deoxygenated blood from the right ventricle to the heart, while systemic circulation involves the transport of oxygenated blood from the lungs to the left ventricle.
  3. The pulmonary circulation involves the pulmonary arteries and the systemic circulation involves the pulmonary veins.
  4. The pulmonary circulation plays the main role of oxygenating the blood, and the systemic circulation plays the main role of supplying oxygen and nutrients to body tissues.

Final Thought

The main conclusion from the above discussion is that the pulmonary and systemic circulation is a completely different set of circulation that together form the circulatory system of the body.

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