BIO 311C Lecture Notes - Lecture 15: Paracrine Signalling, Extracellular Fluid, Cell Junction
Document Summary
Membrane potential- the difference in charge on the inside and outside of the cell membrane. Opening potassium channels in a cell that were once gated with hyperpolarize the cell (the positive charge moves to the outside thus making the cell more negative) Na+ and k+ channels open in response to a change in the membrane potential. Refractory period- after an action potential, a second potential cannot occur. Yeast cell mating: there are two types of yeast cells: a yeast and alpha yeast, a yeast makes a factor which is recognized by the alpha yeast receptor and these two cells recognize each other and mate. Cell junctions- actual signals pass from one cell"s cytoplasm to another cell"s cytoplasm. Cell-cell recognition = binding causes signal to be transmitted: proteins on two cells recognize each other and the proteins bind together which transmits a signal. Local regulators and neurotransmitters are ligands (messenger molecules)
