Science, asked by janvimalhotra, 1 year ago

how to end the question why is the pulse always felt at the artery and not the vein

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Answered by dorgan399
1

Why does an artery pulsate while a vein doesn't?

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Ans is

The pumping action of the heart creates a pulsatile flow, as it intermittently projects a bolus of blood from the ventricle to the arteries.


We can feel this pulse, known as a pulse pressure, as it flows down the arterial tree. The arterial tree is relatively low-resistance compared to down the circulation (more distal in the circulation).


The pulse wave is dissipated in the widely spread capillaries. When they reassemble, there is virtually no venous wave. There is some in the “central circulation”, which is caused by the atrial contraction and/or ballooning of the tricuspid valve into the right atrium during ventricular systole.


The magnitude of this pulse wave is about 2–3 cm H20, and the mean venous pressure is between 5–20 mm Hg (Compared to a mean arterial pressure of 95 mm Hg).


Centrally, which is where the venous pressure is highest, the waveform looks like this:



The second “e” of word “Pressure” is at about 10–15 cm H20.


So:


A2A: There is more smooth muscle in arteries. If you connect arterial pressure to the vein, the vein has to grow more muscle to be able to tolerate the pressure.


A2A: The innervation of the arteries has nothing to do with the pulsation, except to change its magnitude (dilating the arteries will lower the pressure and thus the pressure wave).

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