Human heart has four chambers right atria left atria right ventricle left ventricle. But in organisms like fishes don't have four chambers
2006-07-07 02:27:13 · 11 answers · asked by suraj_s_l 1 in Science & Mathematics ➔ Medicine
because a Fish's circulatory system isn't as advanced as a Human's.
2006-07-07 02:42:16 · answer #1 · answered by Anonymous · 1⤊ 1⤋
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.
A median septum located between the left and the right heart to solve the problem of the mixing of the oxygenated and deoxygenated blood.
The question is why not two chambers?
The heart has two actions: relaxation and contraction.
In simple terms, during contraction, blood flows into the both atriums and at the same time pumps the blood out of the heart to all parts of the body.
If the heart has only a left chamber and right chamber, blood is either getting pumped out of the heart OR flowing into the heart. The human body is complex and if mammalian hearts beat slowly, mammals are not going to receive sufficient amounts of oxygen for survival.
Comparing to fishes, they have a single systemic circulation. (Mammals have a double circulation system: pulmonary and systemic circulation). Due to their relative quick gases exchange rate at the gills, blood is constantly renewed with new oxygen while carbon dioxide is given out.
p/s:btw fishes dont have hearts! they only have gills...:)
2006-07-07 04:27:01 · answer #2 · answered by stormalive_32722 2 · 0⤊ 0⤋
The Heart Has Four Chambers
2016-11-07 01:17:48 · answer #3 · answered by ? 4 · 0⤊ 0⤋
Higher metabolic rates were made possible by the more efficient pump that a four chambered heart provides.
A redundant chamber appeared most likely as the result of a mutation in a control sequence gene which gave the original organism better performance in survival situations. That is, more stamina and less baseline consumption of metabolic resources when at rest.
The remainder was just a process of gradual refinement.
mammals, dinosaurs and birds were able to evolve because of this improvement. We exist because the four chambered heart makes our kind of biology possible.
2006-07-07 10:17:16 · answer #4 · answered by corvis_9 5 · 0⤊ 0⤋
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.
2006-07-07 02:39:34 · answer #5 · answered by westervel 3 · 0⤊ 0⤋
Its simpler to think of just the two ventricles; the atria just help load the ventricles with blood. The key concept has to do with getting blood to flow through the lungs.
The powerhouse left ventricle sends freshly oxygenated blood to all organs of the body (except the lungs)under very high pressure (120/80). When that blood returns toward the heart it is under very low pressure, as in the blue veins in your arm. There is not enough pressure left to overcome the resistance to flow through the lungs. The right ventricle is needed to boost the pressure just a bit (to 25/12) so it can be sent through the lungs. There, it is re-oxygenated before returning to the main pumping chamber - the left ventrcle.
2006-07-07 08:40:45 · answer #6 · answered by dybydx 4 · 1⤊ 0⤋
why does humans have hands,nose ,liver?????????????
we know how the body works[in general]
we don't have a lot of answers to that too,mostly suppositions ,other ways ,we should have treatment for cancer ,for heart diseases ,and in general for all the disease
medicine is not an exact science
but WHY are we built like that with liver and 4 chambered heart,and so on ,i think only genetic selection and evolution may have some real answers
but we don't really understand that too
2006-07-07 07:21:30 · answer #7 · answered by qwq 5 · 0⤊ 0⤋
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.html
2006-07-07 02:35:43 · answer #8 · answered by theua_s 2 · 0⤊ 0⤋
a small motorbike needs a single carburetor for its engine. a lorry would need four to six.
fish = small motorbike.
lorry = human.
carburetor = heart
2006-07-08 01:32:38 · answer #9 · answered by shydock 3 · 0⤊ 0⤋
This is a very interesting topic
2016-07-27 03:57:25 · answer #10 · answered by ? 3 · 0⤊ 0⤋