BIOL 121 Lecture Notes - Lecture 16: Griddle, Resting Potential, Threshold Potential
Document Summary
Membrane potentials- allow us to interact along a neuron. Move open k+ channels then open na+ channels. Need to assume that there are large anions trapped in the cell. This is not static, it is constantly in flux. Stimulus us -70mv, this is also referred to a charged difference or potential difference. Apply a stimulus which will change the permeability so we can open or close channels by diffusion normally. Excitatory means more likely to result in neurotransmitter release. 55 is still negative but more positive than resting (-70) Repolarization is a return to resting if we open potassium channels there is more potassium moving out, so more positive charge is moving out so therefore it becomes more negative. This is called a hyperpolarization, typically this is less likely to reach a action potential so it is called inhibiting. Increase the size of stimulus increases the size of the potential. Decremental propagation- decrease by increment (butter on a griddle)
