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Arteries and Veins

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Arteries and Veins

Postby Navin » Wed Aug 17, 2005 12:47 pm

I know that the heart pumps blood and that the arteries transport this blood in spurts related to the pumping of the heart.

I want to know if the muscles on the walls of the arteries dilate and constrict (as in peristalsis) to push the blood foward or is it totally dependent on the pump of the heart?

Also there are semilunar valves in veins. So how many flaps are there in one valve?
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Postby opuntia » Wed Aug 17, 2005 12:53 pm

The pressure generated in the heart enable the flow of blood through veins and arteries...arterial walls expand and contract with each heartbeat, pumping blood throughout the body. The pulsating movement of blood, or pulse, may be felt where the large arteries lie near the body surface.
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Postby Dr.Stein » Wed Aug 17, 2005 1:22 pm

Veins do not equipped with any valves.
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Postby MrMistery » Wed Aug 17, 2005 7:00 pm

@opuntia
Pulse is the shock wave that arrises when the that comes from the heart hits the blood already present in the aorta. it ca, indeed be felt at the surface even with your hand. the tension which arises from the arteries expanding and sending the blood forward continuosly is artherial pressure(blood pressure)
@Dr.Stein
Veins do have valves. I think the answer you are looking for it 2, but i am not sure what flaps are
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Postby sdekivit » Wed Aug 17, 2005 7:28 pm

msucles in arteries are also responsible for dilating so that more blood can run through it. The example the boys all know: penile erection. This process is under influence of the parasympathetic and sympathetic nervous system.
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Postby MrMistery » Wed Aug 17, 2005 7:30 pm

Yes, that is true. It is the parasympathetic nervous system that causes an erection
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Postby mith » Wed Aug 17, 2005 9:54 pm

veins have valves so the blood only flows one way--towards the heart.
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Postby sdekivit » Thu Aug 18, 2005 4:19 pm

mithrilhack wrote:veins have valves so the blood only flows one way--towards the heart.


and when they are leak you have a varicose vein :twisted:
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Postby MrMistery » Thu Aug 18, 2005 6:16 pm

Yep, because the pressure in veins is very small. Our books say that pressure in big veins is negative, but i am not sure that is possible. I mean, a better term would be force of apiration than negative force of pressure
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Postby vinaya » Wed Oct 05, 2005 11:30 am

the main valves r present between the atria & the ventricles
the one between the right atria & right ventricle is the tricuspid valve &
the one between the left atria & left ventricle is the bicuspid valve
actually the valves look like they have leaflets
thats y they are called ----cuspid valves
cuspid means leaf-like :)
the tri.... valve has 3 such leaflike structures while the bi..... has 2
logical right :lol: :P :D :) 8)
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Postby victor » Fri Oct 07, 2005 1:07 pm

Hmm...but I learn that in right heart lobus, it's a tricuspidal valve but in left heart lobus, it's mitral valve....is it the same?
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Postby vinaya » Fri Oct 07, 2005 3:43 pm

yea
bicuspidal valve and mitral valve refer to the same valve :) :D
these valves are also called atrioventricular valves or the auricloventricular valves{atrium=auricle}
so
the mitral valve can also be called left atrioventricular valve or the auricloventricular valve and similarly the right

actually theres a hint provided for remembering which's for which
tricuspidal valve

right :o

he he he :lol: :lol:
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