Lesson 26: Topic 22 - Capillary Filtration and Reabsorption

Question 1

what is capillary filtration?

Answer 1

fluid exiting the capillary into the interstitial fluid

Question 2

what is capillary absorption?

Answer 2

fluid entering the capillary from the interstitial fluid

Question 3

what is the primary function of capillary filtration/absorption?

Answer 3

regulate/dictating the distribution of extracellular fluid between the plasma and interstitial fluid
- also plays an important regulatory role in moving solutes (not gases) in and out of the capillary

Question 4

why is capillary filtration and absorption not playing a role in moving gases in and out of the capillary?

Answer 4

because gases can readily diffuse across. they do not need the help of filtration/absorption to do so

Question 5

whether a substance is filtrated of absorbed is predominantly dictated by?

Answer 5

hydrostatic pressure and osmotic pressure

Question 6

what is hydrostatic pressure?

Answer 6

refers to the pressure being induced by the fluid within a confined space
ex1. in a capillary, we have blood in a confined space and that is going to be exerting a certain pressure on the capillary that will drive the liquid into a certain direction
ex2. we have fluid inside the interstitial fluid and that is going to generate a pressure.

Question 7

what is osmotic pressures?

Answer 7

the pressure dictated by solutes (dissolved substances that are inside a substance and fluid
ex. if two balloons were able to diffuse, water will move into salty water to dilute salty water (think grade 12)

Question 8

what are the two places we can have hydrostatic and osmotic pressures?

Answer 8

• capillary (capillary hydrostatic pressure Pc and Osmotic force (PiC - Plasma proteins)
• interstitital fluid (interstitial fluid hydrostatic pressure Pif and Osmotic force (interstitial fluid proteins PiIF)

Question 9

the osmotic forces that are going to be dictated by the movement of fluid is going to do with the osmotic forces insider the capillary due to?

Answer 9

plasma proteins (albumin)

Question 10

why do we want something like albumin to not be able to leave the capillary?

Answer 10

because they play an important role in driving liquid back into the capillary

Question 11

any plasma proteins that are inside the interstitial fluid can help draw liquid into?

Answer 11

the interstitial space

Question 12

how can net filtration pressure be calculated?

Answer 12

with adding the forces that dictate capillary filtration(PC and PiIF) and subtracting the forces that dictate capillary absorption (PIF and PiC)

Question 13

what dictates capillary filtration (the movement of fluid over of the capillary)?

Answer 13

• capillary hydrostatic pressure
• osmotic force (interstitial fluid proteins)

Question 14

if net filtration pressure is positive, what does that dictate?

Answer 14

an outward movement of fluid from the capillary into the interstitial space (filtration)

Question 15

if net filtration pressure is negative, what does that dictate?

Answer 15

an inward movement of fluid from the interstitial space into the capillary (absorption)

Question 16

blood pressure in a capillary =

Answer 16

capillary pressure

Question 17

what is the capillary hydrostatic pressure on the arterial end of a capillary?

Answer 17

37mmHg

Question 18

what is the capillary hydrostatic pressure on the venous end of a capillary?

Answer 18

17mmHg

Question 19

what is the osmotic force of the capillary at the arterial end of a capillary?

Answer 19

25 - ALWAYS - albumin does not go anywhere EVER. when we are exercising it still does not leave the capillary