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Heart

Postby MIA6 » Wed Jan 10, 2007 2:56 am

Do veins carry deoxygenatd blood which is filled with CO2? I think some part of veins carry deoxygenated blood to the right atrium. But the heart is pumped by left ventricle, right? so there must be some blood go into the left ventricle to let it work? So then the blood in the right ventricle goes into pulmonary arteries, then lungs, and then pulmonary veins carries oxygenated blood into left atirum -->left ventricle ?
Hope you can help me!
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Postby sachin » Wed Jan 10, 2007 4:10 am

MIA;
Veins caies Deoxygenated blood(co2)....
and they carry it to right auricle---->R.Vetricle--->Pulmonary artery----->Lungs---->Pulmonary vein----->Left auricle----->L.ventricle----->vena cava--->arteries----->arteioles----->||veinules----->veins---->To right auricle

Both ventricle(R & L) pumps heart.... Pumping of auricles is an reflex action...
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Postby kjle » Wed Jan 10, 2007 10:08 am

Veins caies Deoxygenated blood(co2)....


This definition is not really correct. Veins usually carry deoxygenated blood, but they're real definition is that they carry blood back to the heart. I know I'm being picky, sry.


The vena cava takes blood to the heart from the body.
This blood goes into the right Atrium, which then drains into the right Ventricle.
It is pumped to the pulmonary circuit.
Which begins with pulmonary trunk, then goes to pulmonary artery, then to the lungs, blood is now oxygenated, then goes into pulmonary veins into the right atrium.
The left atrium "pumps" into the left ventricle which pumps the blood into the aorta (the body's main artery).
From there it goes to arteries, to arterioles, to capillaries, to veinules, to veins, and back into the vena cava.


BTW I assume Auricles is another word for Atria.
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Postby Amrik » Wed Jan 10, 2007 11:50 am

sachin_at_biog wrote:MIA;
Veins caies Deoxygenated blood(co2)....
and they carry it to right auricle---->R.Vetricle--->Pulmonary artery----->Lungs---->Pulmonary vein----->Left auricle----->L.ventricle----->vena cava--->arteries----->arteioles----->||veinules----->veins---->To right auricle

Both ventricle(R & L) pumps heart.... Pumping of auricles is an reflex action...


Not All Veins carry deoxygenated blood. In the Lungs gaeseous exchange takes place...CO2 from Pulmonary artery (which have now branched into capillaries) enters the alevoli and O2 from the alveoli enters the capillaries...these capillaries which just got O2 joins back to form Pulmonary VEIN

So, There is only one vein in our body that carries blood with O2 that is Pulmonary Vein and also only one Artery that carries CO2, that is Pulmonary Artery..Rest all veins carries blood with CO2 and all arteries carry O2 ;)

kpoehlke wrote:BTW I assume Auricles is another word for Atria.


Yes, you are right! and Atrium pulral (i guess)
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Postby MrMistery » Wed Jan 10, 2007 2:46 pm

atrium is singural, and atria is plural. An auricle is a small conical pouch projecting from the upper anterior part of each atrium of the heart
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Postby Darby » Wed Jan 10, 2007 6:50 pm

Veins carry blood to the heart, as has been said here, and in the heart-lung / pulmonary loop, there's oxygenated blood in there.

It's more than just a direction-based definition, though - veins are structurally quite different from arteries or capillaries. Structurally, arteries are set up to carry highly pressurized blood, capillaries are set up to foster exchange between the blood and the tissues, and veins are set up to collect low-pressure blood without much of a push behind it and get it back to the pump.

Many years ago, "atrium" and "auricle" were taught as the same thing, so I would assume that if you have an old source, those could be confusing.
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Postby kjle » Wed Jan 10, 2007 11:02 pm

MrMistery wrote:atrium is singural, and atria is plural. An auricle is a small conical pouch projecting from the upper anterior part of each atrium of the heart


And what purpose do they serve?
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Postby Amrik » Thu Jan 11, 2007 11:40 am

kpoehlke wrote:
MrMistery wrote:atrium is singural, and atria is plural. An auricle is a small conical pouch projecting from the upper anterior part of each atrium of the heart


And what purpose do they serve?


There Function is Just to recieve blood and then pass it on to the ventricles...
Now you have got me thinking if just only that then what's the use of it? :? I will try searching the internet for it!
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Postby kjle » Thu Jan 11, 2007 8:46 pm

Amrik wrote:
There Function is Just to recieve blood and then pass it on to the ventricles...

This is the function of the Atria right? I was asking about auricles, sorry I didn't make that clear.

Now you have got me thinking if just only that then what's the use of it? :? I will try searching the internet for it!


I'm not entirely sure, but I would guess the use of the atria is to kind of just hold the blood till they fill, then pump it into the ventricles. I think all of the blood needs to go into the ventricles at the same time as opposed to like draining in. Otherwise the ventricles may pump when they aren't completely full and cause weak pressure.

I don't know, this was just a (educated?) guess.

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Postby MrMistery » Thu Jan 11, 2007 8:58 pm

Good question. Why doesn't the heart have only ventricles? Well, your answer is correct. the ventricles contract for 0.30 seconds and relax for 0.50 seconds, folllowed by another contraction. There simply wouldn't be enough time for the ventricles to fill with blood in those 0.50 seconds. And if the relaxation period were to increase, it would have to increase a lot, thus posing major problems in the supply of oxygen and nutrients. So the solution evolution found is deposit all the blood in the atria and keep it there. when the ventricles relax, the atrio-ventricular valves open and the blood flows according to gravity. the atria also contract, but the contraction is short(0.1 seconds) and inneficient. gravity does most of the work.

As for the role of the auricles.. I Have no idea... I learned what they are for anatomy class, i don't really care..
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Postby kjle » Thu Jan 11, 2007 10:56 pm

cool, thanks for the info Andrew
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Postby Darby » Sun Jan 14, 2007 11:43 pm

I think that auricles are used as a space to take blood when adrenaline squeezes the vessels, raising pressure but also (potentially) lowering volume in the vessels. Under normal conditions, they don't really fill with blood like the chambers do.

The atria are used to fill the ventricles, which are heavily muscled and wouldn't fill with blood unless the blood were given a decent push in.
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