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Answer:
Let's follow the flow of blood starting at the Aorta, the aorta is the main blood vessel that carries O2 rich blood to the vital organs, organs, systems, extremities, muscles, and most importantly the brain. All the above mentioned use the oxygen and give off carbon dioxide as a by product. The CO2 , carried by the blood travels back to the heart and enters the Right Atrium, another beat of the heart, the blood now moves through the tricuspid valve to the right ventricle. Remember, this is oxygen poor blood so with another beat the blood moves through the pulmonary arteries, (left & Right), to the lungs. Inside the lungs the blood drops off CO2 and picks up O2 using a process called osmosis*. The blood at the moment has little pressure so it goes back into the heart through the Pulmonary Veins into the Left Atrium. A beat of the heart sends it into the Left Ventricle. Around this chamber is a large muscle called the Myocardium and this muscle gives the pressure needed to push this blood around the entire body.
*Osmosis, the diffusion of water or another solvent through a selectively permeable membrane. This membrane is like a sieve, allowing solvent molecules, which are small, to pass through it, but preventing larger molecules dissolved in the solvent from passing through.
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DJGnome
DJGnome
First answer by Science 12.
Last edit by Science 12.
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