Hi learners, hope all of you have a good time. At first I wanna thank @OverThinker for giving me inspiration to write and then i can start my todays article. Hope you will find it helpful for all.
Circulatory systems of the body
Source of figure: guyton physiology page 171
Do you know there are 2 types of circulatory system in our body.
1. Systemic circulation
2. Pulmonary circulation
Systemic circulation refers to the circulation which starts from the left ventricle and ends at right atrium.
Pulmonary circulation refers to the circulation which starts at right ventricle of the heart and ends at left atrium.
Systemic circulation: here from the left ventricle through the aorta oxygenated blood is ejected and conveyed to the whole body via aorta-arteries-arterioles-capilliaries. However, then the body tissues utilizes the oxygenated blood and the blood becomes deoxygenated as it has losed its oxygen. These bloods are than collected by the venules-veins and at last via inferior vena cava, superior vena cava and thebasic veins deoxygenated bloods reaches the right atrium of the heart.
From the right atrium of the heart the blood rushes to right ventricle passing through the tricuspid or semilunar valves.
Now here in the right ventricle these bloods are deoxygenated so it needs to be oxygenated. For that purpose, it moves through the pulmonary artery towards the lungs (right and left) .
(Note: here pulmonary arteries contains deoxygenated blood where all other body arteries contain oxygenated blood. Dont worry this is the only exception you have to remember.
Again pulmonary vein is the only vein to contain oxygenated blood whereas all other veins of the body contain deoxygenated. This is also an exception.
You can note it as it might be helpful for you in the next.
So definition of artery can be the blood vessel which comes out from the heart . And the veins are the blood vessels which ends towards the heart
Nor the definition should emphasize that which blood vessel contain oxygenated or deoxygenated.
I hope everyone can understand this. If not, feel free to leave a question in the comment box. I will appreciate your desire to learning)
In lungs these bloods remove carbondioxide out via air during each breath and they take up oxygen and become oxygenated. About 40 milliliters of oxygen ( O2) is absorbed for each liter of blood. So in total for 5 liters of blood about 200 mililiters of oxygen is absorbed. Then these oxygenated blood reaches the left atrium of the heart via the pulmonary vein. Here pulmonary circulation ends and systemic circulation again starts from the left ventricle.
Systemic circulation again starts its quite true but I dont want to lose your time anymore.lets end here today.
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This is one of my favorite topics way back when I was in middle school. Thanks for this