Khan Academy Static

2A: Each cell in your body has a “membrane potential.” Think of it like rolling a ball to the top of a hill - once the ball is at the top, it is smooth sailing down. Similarly, this electric membrane potential allows ions to flow down a gradient of electrical energy (the inside of the cell is negative relative to the outside). We will discuss this concept as well as other mechanisms for movement of ions, water, and other molecules across cellular membranes.

14910_Permeability_and_membrane_potentials.html

14907_Exocytosis.html

14906_Secondary_active_transport_in_the_nephron.html

14908_Membrane_potentials_part_2.html

14901_How_do_things_move_across_a_cell_membrane_.html

14909_Membrane_potentials_part_1.html

14902_Passive_Transport_by_Facilitated_Diffusion.html

14903_Diffusion_and_osmosis.html

14905_Sodium_potassium_pump.html

14904_Glomerular_filtration_in_the_nephron.html