True or False only blood that is low in oxygen flow into the chambers of the heart?

Answer 1

False.

REASON: Let's follow the flow of blood starting at the Aorta, this is the biggest artery in the body and it provides a passage for blood coming out of the left ventricle - (the ascending aorta leads to the superior part of the body and the descending aorta leads downwards to the inferior part of the body), the main blood vessel that carries O2 rich blood to the vital organs, (Brain, Lungs, Heart & Skin), non-vital organs, (Liver, Pancreas, Stomach, Spleen, Kidneys, Bladder, Sex Organs, .....), extremities, (Arms & Legs), & Muscles, and returns with O2 poor. 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, the blood then moves through the tricuspid valve to the right ventricle. Remember, this is oxygen poor blood so then 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 insufficient pressure so it goes back into the heart through the Pulmonary Veins into the Left Atrium, from there through the Mitral valve into the Left Ventricle. Around this chamber is a large muscle called the Myocardium, this muscle is large enough to provide the pressure needed to push this blood around the entire body.

In the average person, (approxamately 82kg or 180lbs):

- there are approxamately 6 l or 10.5pts of blood

- the lungs can hold approxamately 6l or 10.5pts of air

- about 400 000km or 250 000mls of blood vessles, (I do not know the source of this bit of trivia)

*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.