PSY 324 Chapter Notes - Chapter 3: Excitatory Postsynaptic Potential, Inhibitory Postsynaptic Potential, Ligand-Gated Ion Channel
17 Apr 2016
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Document Summary
Cajal anatomically demonstrated a narrow gap separating one neuron from another. Sherrington physiologically demonstrated that communication between one neuron and the next differs from communication along a single axon. Synapse specialized gap between neurons, point of communication between two neurons. Flexion and extension reflexes are controlled by the spinal cord. Reflex arc the circuit from sensory neuron to muscle response. Transmission through a reflex arc is slower than transmission through an equivalent length of axon. Temporal summation summation over time in which repeated stimuli within a brief time are cumulative. Several impulses from one neuron at different times. Graded potentials can be either depolarizations (excitatory) or hyperpolarizations (inhibitory) A graded depolarization is an epsp excitatory postsynaptic potential. Occurs when gates allow sodium to enter the neuron"s membrane. Spatial summation summation over space in which synaptic inputs from separate locations combine. Ensures that a sensory stimulus stimulates neurons enough to activate them. Impulses from several neurons at the same time.
