Topic 2.7 - Facilitated Diffusion 𖦹⋆｡°✩ Flashcards
what can facilitated diffusion transport
༻ large and small polar molecules
༻ large quantities of water can pass through aquaporins
༻ charged ions (Na+ and K+) require channel proteins
what does active transport establish
active transport establishes and maintains concentration gradients by moving molecules/ions against their concentration from low to high concentrations
what is another name for carrier proteins
pumps
what do carrier proteins require
metabolic energy such as ATP
what do carrier proteins establish
they establish and maintain concentration gradients
what are membrane proteins necessary for
active transport
what is cotransport
a secondary active transport that uses the energy from an electrochemical gradient to transport 2 different ions across the membrane through a protein
what is symport
2 different ions are transported in the same direction
what is antiport
2 different ions are transported in opposite directions
what can happen to membranes by the movement of ions
membranes may become polarized by movement of ions
what is an electrochemical gradient
a type of concentration gradient
what is membrane potential
the electrical potential difference (voltage) across a membrane
what does the cell membrane allow for
the cell membrane allows for the formation of gradients
what contributes to membrane potential
the Na+/K+ ATPase (pump) contributes to the maintenance of the membrane potential
how many of each ion are pumped
༻ 3 Na+
༻ 2 K+
