Flashcards in Introduction to Epithelia and Epithelial Transport flashcards Deck (8):
Form single layer of cells and function to move solutes (and water) across cell membranes and from one compartment to another
Polarity of epithelia
2 distinct sides 1. Apical side (facing the tissue lumen) 2. Basolateral side (facing the intercellular solution and bloodstream
Movement of water and solutes through tight junctions between epithelial cells
Movement through the epithelial cells
Faces the intercellular solution and bloodstream. Has a high density of Na+/K+ pump molecules maintaining large transmembrane gradient to be used for secondary active transport.
Charges moving across membranes
Must be balanced. If moving positive charges then must either move negative charges in the same direction or move positive charges in the opposite direction
Do transport of solutes across epithelia increase when action potentials occur?
No; there are no action potentials in epithelia