Please enable JavaScript.
Coggle requires JavaScript to display documents.
Ch12 Transport Across Cell Membranes, Charge quantity
must be balanced…
-
-
small, uncharged, polar can diffuse across
-
work in same dir: steep gradient
work in opposite dir: small gradient
membrane potential governed by permeability
-
-
Transmembrane pores that allow passive movement of small, water-soluble molecules, ions in/out
-Need to undergo conformational changes for ions
-Lower max rate of transport
-Can couple ion from to E source to carry out active transport
-does NOT need to undergo conformational change for each ion it passes
-advantage over transporter: higher max rate of transport
-cannot couple ion flow to E source for active transport
-make memb transiently perm to selected inorg ions