BIO SCI E109 Chapter Notes - Chapter 7: Neuromuscular Junction, Postsynaptic Potential, Cell Membrane
1 Oct 2016
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7. 3 electrical signals in neurons: graded potentials can be depolarizing or hyperpolarizing. Graded potential: a small deviation from the membrane potential that makes the less polarized[depolarizing graded potential]/more from several membrane either polarized[hyperpolarizing graded potential]. milliseconds(msec) to several minutes. Graded potential: electrical signals vary in amplitude(size), depending on the strength of the stimulus. Graded potentials are larger or smaller depending on how many channels change& how long they remains open. Occurs when a mechanically (dendrite)/ligand-gated(cell body&dendrite) channel close. to mechanical stimulus(pressure) open mechanically-gated channel allow cell cations neurotransmitter acetylcholine(ach) open cation channel. (na+ inflow is greater than ca2+ inflow/k+ outflow) epsp open/ into. Ach metabotropic receptors coupled to g pro open k+ channel ipsp neurotransmitter glycine/gaba opens a cl- channel hyperpolarization. Neurotransmitter muscarinic acetylcholine opens k+ channel ipsp. Graded potential local current flow[passive movement of charges from one region of membrane to adjacent regions due to differences in tm.
