BIOL 2160 Chapter : Chapter 7 Neurons
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Chapter 7 nerve cells & electric signaling: organization of the nervous system fig 7. 1. Sensory or afferent: conduct impulses from receptors to cns. Motor or: efferent: conduct impulses out of cns to effector. Association or: interneurons: located entirely within the cns. Axon hillock: where axon originates and action potentials initiated. Synapse: space between a neuron & another cell. Leak channels: open or close in response to change in membrane potential, always open, throughout neuron, resting membrane potential. Ligand-gated channels: open or close in response to ligand binding, dendrites & cell body, synaptic potentials. Sodium and potassium channels: throughout, but more in axon (especially axon hillock, action potentials. Go to book website go to ip-10 and review basic info on voltage gated channels. May secrete epo for increased oxygenation of brain. Maintain normal electrolyte composition of isf in cns. Protect neurons against toxic substances and oxidative stress.
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