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The heart is made of four chambers, two atria (singular atrium) and two ventricles. When looking at an image of the four chambers of the heart the chambers on the right are referred to as the left atrium and ventricle while the chambers on the left are referred to as the right atrium and ventricle. This is because while inside a persons body the right atrium and right ventricle would correspond with their right side of the body, when looking at these images we are seeing a mirror image.

When looking at blood flow through the body we begin with oxygen-deprived blood entering the right atrium via the superior and inferior vena cavas. The blood then goes through the tricuspid valve, which is an atrioventricular valve, and enters the right ventricle. The right ventricle contracts, pumping the blood through the pulmanary valve, a semilunar valve, and through the pulmonary arteries to the lungs. In the lungs, oxygen diffuses into the blood which then returns to the heart's left atrium by way of the pulmonary veins. Contraction of the left atrium pushes the blood through the bicuspid (mitral) valve, also an atrioventrical valve, and into the left ventricle. The left ventricle is the largest chamber and is required to pump the blood through the semilunar aortic valve into the aorta which disperses the blood throughout the body.

Systemic Circulation is the route in which oxygenated blood is pumped from the left ventrical to all tissues in the body. This is responsible for delivering nutrients to the body cells and removes waste.

Pulmonary Circulation brings deoxygenated blood from the right ventricle to the lungs for gas exchange in which the deoxygenated blood becomes oxygenated.

2007-01-05 05:37:04 · answer #1 · answered by M M 4 · 0 0

When the de-oxygentated blood leaves the heart to the circulatory system it passes through the artery which narrows into an arteriole then narrowing to a capillary, in the capillary is where the gaseous exchange takes place, and diffusion occurs, equalising the levels of carbon dioxide and oxygen within the capillary creating oxygentated blood, which as you know then travels back to the heart and onto the systemic circulatory system. So that is how is plays a central role, as it uses gaseous exchange to change de-oxygentated blood to oxygenated blood.
I hope I put that so you could understand it, a & p is so hard to explain!!!!
Good Luck

2007-01-05 13:48:45 · answer #2 · answered by happyballerinagirl 2 · 1 0

The heart contracts and forces blood through the vascular system, allowing the blood to exchange gases with interstitial fluid.

Basically, without the cardiovascular system, there would be no way to get rid of the CO2 produced by the body...and we would die from CO2 poisoning...and we would not be able to get necessary oxygen to the cells of the body.

2007-01-05 13:37:40 · answer #3 · answered by Brandon W 5 · 0 0

webschoolsolutions.com/patts/systems/heart.htm check this site out, it tells you a lot, it's quite informative.

2007-01-07 14:15:46 · answer #4 · answered by tribalgirlie 2 · 0 0

Good Question.

The cardiovascular system is the driving force b..................Yawn....................

2007-01-05 13:37:32 · answer #5 · answered by Spiny Norman 7 · 0 2

ive got no idea

2007-01-05 13:35:55 · answer #6 · answered by Anonymous · 0 1

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