BI111 Chapter Notes - Chapter 113: Chemical Potential, Atp Hydrolysis, Membrane Potential
Document Summary
In land plants, uptake of water usually takes place through roots in the soil, far from the leaves where water is lost in exchange for carbon dioxide. Water and solutes can travel in and out of plant cells by passing though the cell wall and plasma membrane. Symplast: interconnected region of plant including area in pm of living cells and connected via plasmodesmata: water and solute can travel through the plant using symplastic route. Apoplast: everything outside the pm of living cells, including cell walls, extracellular spaces and interior of dead cells specialized for water transport: water and solute can also travel through apoplastic route. Selective permeability of the pm allows certain classes of molecules to pass into or out of the cell. Passive transport: molecules moving from areas of concentration to concentration. Active transport: molecules moving from concentration to concentration: requires use of atp, ex. proton pumps.
