Forces Acting Across Membranes 1 Flashcards
(26 cards)
State the function of the cell membrane
The cell membrane separates ECF and ICF and is responsible for maintaining the difference in their composition
State the function of the capillary wall
The capillary wall seperates plasma from ISF
What is the major difference between the ECF and the ICF?
Their chemical composition
What is ratio of Total body water within the ECF compared to the ICF?
ECF = 14L 1/3 TBW
ICF = 28L 2/3 TBW
Describe the movement of water across the capillary wall and cell membrane
There is no barrier to the movement of water in the body
What are aquarporin channels?
Aquaporin channels are channels which are permanently open to water
Describe the movement of gas across the capillary wall and cell membrane?
Gas can pass freely across all compartments
Describe the movement of ions across the capillary wall and cell membrane
Ions can move freely across the capillary wall but cannot penetrate the cell membrane
Describe the movement of nutrients and waste across the capillary wall and cell membrane
Nutrients and waste can generally move easily across both barriers but sometimes require help crossing the cell membrane
Describe the concentrations of K+ and Na+ ion in the ICF and ECF
What is meant by the cell membrane being a selective barrier?
What is the cell membranes ability to vary permeability important for?
What is meant by membranes being dynamic?
What is the structure of the cell membrane?
Describe the structure of a phospholipid.
What is embedded in the phospholipid bilayer?
Why are membranes flexible?
What is meant by membranes being insulators against movement of electrical charges?
What are the 4 general classes of membrane proteins?
What are integral membrane proteins?
What are peripheral proteins?
What do receptors do?
What are transporters?
What are the 2 forms of transporter
