BIO SCI E109 Chapter Notes - Chapter 7: Resting Potential, Tandem Pore Domain Potassium Channel, Cell Membrane
1 Oct 2016
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7. 3 electrical signals in neurons: neurons and muscle fibers: excitable cells (exhibit electrical excitability) Electrical excitability: the ability to respond to a stimulus and convert it into an action potential [in a neuron(muscle): nerve(muscle) action potential/ nerve(muscle) impulse. ] The production of electrical signals depends on 2 basic features of the plasma membrane of excitable cells: The presence of specific types of ion channals. The existence of a resting membrane potential: ion channels permit certain ions to move across the plasma membrane. 1 leak channel: more k+ leak channel(leakier) than na+ leak channel. 2 ligand-gated channel: participate in the generation of graded potentials located at the dendrites and cell bodies. 3 mechanically-gated channels: located on the dendrites of sensory neurons or in sensory receptor cells. 4 voltage-gated channels: located on axons: resting membrane potential (voltage exists in an excitable cell at rest) The excess charges are located only very close to the membrane, the rest of the.
