Recent content by coolia

Hi, I think I found the answer. I have two theories both are similar. Firstly, Pousielle's law still applies, Pa-Pv=Resistance * Flow rate. To recap the condition, the alveolar pressure (or pressure outside the vessel ) is greater than the venous pressure but less than arterial. So, even though...

Sorry, can't think of an example where a precipitous drop in venous pressure is not accompanied by a drop in arterial pressure. But I do know if this where to occur in the situation described, if both arterial pressure and venous pressure dropped by the same amount the flow would decrease...

Thanks for the reply, I'll try to be more succint. When alveolar pressure is greater than venous pressure in the lungs (but not greater than arterial pressure), the capillary at the downstream end would collapse. They say that the pressure driving the flow is Arterial pressure - Alveolar...

I posted this question in the physics forum with no luck, the concept has to do with physics but it's applications is within the body. It is found in the lung and also in venous return curves, when central venous pressure drops below 0. Basically, I am asking how the concept of zone 2 in the...

How do we know wether to put our threads in the homework subforum from any other section. I had a question about blood pressure that wasn't related to any homework yet my thread was moved.

You are saying the pH changes by adding acid, but H+ reacts with the conjugate base so there no longer is a pH change. So then how does pH change?

I'm sorry, I don't understand how that answers the question. The use of HF/NaF is arbitrary any buffer will do.

I'm guessing the pouiselles equation doesn't take into consideration kinetic and gravitational potential energy. Bernoulli's equation does however. So constant, = v^2/2 +gh +P/p. gh will be higher at top, but at bottom will be turned into a greater P. v does not change throughout the tube...

is there a similar phenomenon in the reverse of a siphon (circulation of inferior extremity) where the maximum height of the siphon is limited due to cavitation?

So I'm assuming pouiselle's abreviated equation work does not hold for this case?, change in P= F x R.

If you add HCl to a buffer solution of HF/NaF, the F- will react with H+ to produce HF. THe new pH can be calculated with the henderson-hasselbach equation. My question is, if F- decreases and HF increases, why and how does [H+] change? HF <> F- + H+ Thank you.

Ok, I agree with that in the circulatory system. However, I was reading Barnes and Levy Cardiovascular book and it shows a U-shaped rigid tube. The inflow pressure was 100 and the outflow was 0. The pressure at the bottom is greatest at appx. 130. Yet, fluid will still flow from one side of the...

When you stand up, blood pressure in your feet rise the most and become appx. 180 mmHg. How then does blood flow throughout the vascular when aortic pressure is 120 mmHg? difference in P=FlowX Resistance

ok I see your point. You are indirectly measuring the radius of veins by taking into consideration the pressure drop. Thanks for the help.

ok, so the pressure drop is not as great because the area of the vessels are large, so there will be less resistance (to power of 4 to be exact). I don't see how there being a less pressure drop could cause there too be more volume in the venous circulation though. I'm I missing something.