Fill in the blanks: Glomerular hydrostatic pressure _____ filtration; colloid osmotic pressure and capsular hydrostatic pressure_____ filtration.

a. favors; favor

b. opposes; oppose

c. favors; oppose

d. opposes; favor

Video transcript

Hi, everyone. Our next problem says, identify the pressure that tries to push water into the glomerular capillaries and opposes filtration. A glomerular hydrostatic pressure. B, glomerular colloid or osmotic pressure, C capsular hydrostatic pressure or d systemic blood pressure. Well, this one's a bit confusing as we can see with these all these different types of pressure. What is, which type, which direction is it going? So let's just think through what specifically we're identifying here. So we're talking about what's going on in the glomerulus that ball of capillaries that is at the start of the Nephron. So we have blood coming in. So you have that ball of capillaries that makes cerus within Bowman's capsule and much of the plasma liquid and solus are forced through the filtration membrane into the renal tubule where it will go on as filtrate. So you have this pressure of blood coming in and then being forced through the filtration membrane. So with that in mind, let's work through these different types of pressures to look for the ones that push water into the capillaries and oppose filtration. So just a glomerular hydrostatic pressure, this is the outward pressure of the blood that's within the capillaries of the glomeruli. So there's blood in there, it has blood pressure just like anything else. And this does not oppose filtration. This is the driving force of filtration. That pressure of that blood is what's forcing the liquid through the capillaries out to become the filtrate. So this is not our answer choice because this promotes filtration. So now let's move on to choice. B glomerular colloid osmotic pressure. So this refers to the pressure that's generated by the presence of proteins, particularly albumin and because of the presence of the proteins in the capillaries but not in the filtrate. This exerts an ismotic pull on water back into the capillaries. This one's a little bit tricky because it does oppose filtration, but it's not a pressure that's pushing waters back water back. It's causing the pool of water back into the capillary. So a little bit subtle but not quite our answer. Choice. C is capsular hydrostatic pressure. And as we can tell by that word, capsular, this is the pressure of the fluid within bowman's capsule. Since it's surrounding NG maris, it is exerting pressure back into the capillaries of sort of opposing entry of fluid from the capillaries. So this pressure is essentially trying to push water back into the glomery capillaries and opposing filtration. So you can see how this is more correct than be the osmotic pressure, which is not this physical pressure against uh blood blood going through the capillaries. So choice C will be our correct answer. But to be thorough, let's just take a look at our last choice. Choice D systemic blood pressure. So that would be the pressure of the blood coming into the capillaries. So it does try to push water into the glomerular capillaries. But because this is the, this is the incoming pressure of blood into the capillaries. This promotes filtration again, would be one of those driving forces of filtration as it's pushing blood into the capillaries towards the kidney. So that's why choice d it promotes filtration is incorrect. So again, the pressure that tries to push water into the glome capillaries and oppose filtration is choice c the capsular hydrostatic pressure. See you in the next video.