CHAPTER 3

Question 1

WATER MOVEMENT BETWEEN ICF/ECF

Answer 1

• NA+ responsible for osmotic balance of ECF space

* K+ maintains osmotic balance in ICF space

Question 2

WATER MOVEMENT BETWEEN PLASMA AND INTERSTITIAL FLUID

Answer 2

• water/Na+/glucose move freely across membrane

* albumin responsible for plasma oncotic pressure (due to high concentration)

Question 3

BODY PRESSURES

Answer 3

• capillary hydrostatic pressure(BP): facilitates outward movement of water from capillary to interstitial space
• capillary plasma oncotic pressure: osmotically attracts water from interstitial space back into capillary
• interstitial hydrostatic pressure: inward movement of water from interstitial space into capillary
• interstitial oncotic pressure: attracts water from capillary into interstitial space

Question 4

MOVEMENT OF FLUID

Answer 4

• plasma flows from arterial to venous > force of hydrostatic pressure facilitates movement of water across capillary membrane into interstitial space
• oncotic pressure remains same, proteins dont cross capillary membrane