In the case of a kidney vessel from point a to point b(a-------------b), say we constrict point b and increase resistance. Would the flow rate be decreased before the constriction at b, or would the flow rate only be changed after the constriction.
Thank you Physicsforums!
The equation for mean arterial pressure = flow * resistance, however, if we increase flow we would increase velocity by the equation Velocity = flow/ cross sectional area, and velocity would decrease pressure according to bernoullies law?
Which would take precedence in generating more pressure...
Thanks everyone for helping me with this. This makes more sense now. The diffusion depends on the volumes and pressures of the particles in question. In the case of the human body, there is enough volume for other particulate pressures to not be able to interfere with the individual diffusion...
I am starting to see a better picture: 1. In the experiment with water: let says in space A we have a 10 o2 molecules and 10 CO2 molecules and are separated by a semipermeable membrane to only CO2 molecules in which space B we have 100 o2 molecules but 5 CO2 molecules. Why would the effect of...
Hi Sophiecentaur,
When looking at this down hill effect, why do we usually ignore the other particles that are within the system? For example, say that there is 10CO2 inthe capillaries and 5 o2 in the capillaries, but in the alveolar, there is 5CO2 and 40o2. Why would the 10co2 in the...
I was wondering why the head has it's own inertia during whiplash when the person is rear ended by another car?
I thought that the head would be moving forward also because it is part of the system of the chair being impacted to move forward?
Hello physicsforums,
I was wondering in the case of CO2 exchange in the capillary and alveolar system, if there is less CO2 in the alveolar, I understand that CO2 will move in the direction to the alveolar from the capillary through diffusion.
My question is, if we are looking at brownian...
Sorry guys for not communicating my thoughts properly. Thanks Boneh3ad for clearing this issue up! I feel better about this concept. Pheww physics can get intense.
I have two more questions that came up as these concepts are becoming more clear
1: in the example of Bernoulli's fluid moving...
If there is no velocity and the fluid is moving still, then there is no kinetic energy, would there be no pressure exerted on the walls?
Or perhaps there is a basal level of kinetic energy of the molecules as they are vibrating?Lastly, how can there still be flow if the pressure gradient is...
I apologize boneh3ad, I did not explain my last question properly as I was having trouble even thinking about this problem.
I was trying to integrate what rc had mentioned on how ,"when blood moves faster, there is less of a perpendicular force direction, therefore there is less pressure on the...
Dear boneh3ad,
Would an explanation for flow without any pressure gradients i.e. constant velocity be due to say inertia? I can't seem to see the fluid move in any other way.
Lastly, at the molecular and atomic level, how would dissipation of energy translate into a loss of pressure exerted...
Ah, that makes sense, thank you nickyferandezzz! I see there was a gradient from the start and as the flow moves, to maintain this conserved flow through an incompressible fluid, there is a trade off in PE to KE.
Could you help me with one more problem. In the human body, why might there be...
In bernoulli's equation: when water is moving at a faster velocity, why is pressure decreased? I searched the forum and someone said that there is less water touching the surface? I do not conceptually see this.
I understand for the lift factor with the example of blowing air over the...
Hi PhysicsForums,
Why would a parallel circuit(or in blood) decrease resistance?
Here is my thought experiment and where I got stuck:
Say from aorta to one arteriole, the resistance is super high on that flow(this big amount of flow is entering a tinier area), but add more arterioles and we...