Differnces between Pulmonary circulation And Systemic Circulation

PULMONARY CIRCULATION:

• The circulation of blood through the lungs is called pulmonary circulation. 
• It helps carry oxygen depleted blood away from the heart to the lungs, and returns oxygenated blood back to the heart.
• This circulation starts with right atrium and ends with left ventricle.
• It was the deoxygenated blood leaves the heart, goes to the lungs and then reenters the heart; deoxygenated blood leaves through the right ventricle through the pulmonary artery to the capillaries where CO2 diffuses out of the blood cell into the alveoli and O2 from the alveoli diffuses into the blood. Blood leaves the capillaries to the pulmonary vein to the heart, where it reenters at the left atrium.
• In this only gas is exchanged i.e., CO2 is released and O2 is dissolved in the blood.

SYSTEMIC CIRCULATION:

• The circulation of blood through the body is called systemic circulation.
• It helps carry oxygenated blood away from the heart to the body and returns deoxygenated blood back to the heart.
• It starts with aorta of the left ventricle and ends with the right atrium.
• In this the blood leaves through the left ventricle to the aorta, which is then sent to smaller arteries, arterioles and finally capillaries. CO2 in a cell is replaced by O2 and the waste is then carried away by the blood to venous capillaries and then the lower inferior vena cava and the upper superior vena cava reenters the heart at the right atrium.
• Along with the gaseous exchange, nutrients are also provided to the metabolizing cells in the body.