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health advisory Hospital Doctor Yu 2007-11-8 19:08:36

Human heart has four chambers right atria left atria right ventricle left ventricle. But in organisms like fishes don't have four chambers

Answers:

because a Fish's circulatory system isn't as advanced as a Human's.

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All four chambers are useful--you need a chamber to recieve the blood from the body(the right atrium), one to bring the blood up to the lungs(right ventricle), one to accept the blood back from the lungs(left atrium), and one to shooot the blood back to the body(left ventricle). Fish are different because they don't have lungs---they oxygenate their blood differently.

http://www.lookd.com/fish/circulation.ht.

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It is because the presents of the septum that separates the ventricle into two different chambers. It prevents the mixture of oxygenated blood with deoxygenated blood. It ensure a efficient circulation system in our body.

Furthermore, human have a 2 way circulatory system namely pulmonary system and systemic system. Both which transfer blood from the heart to different locations and thus required different pressure. And it only can be carried out by two separate ventricles.

Hope it helps.

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A human heart has 4 chambers and basically all mammals have.

In order to prevent the mixing of oxygenated blood and deoxygenated blood, there must be a totally different circulation of these two types of blood.