BIO220H1 : INC - more to follow
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BIO220H1 Full Course Notes
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Morphine a product of opium poppy relieves pain because it can bind to certain neurons in a cns at receptors for naturally occurring morphine like messenger molecules- enkephalins and endorphins. Thus morphine suppresses the transmission of pain signals. chemical messenger acts by binding to a receptor. Plasma membrane of adjacent cells are linked by gap junctions. junctions transmit signal in the adult brain. communication maybe bidirectional or unidirectional in gap junctions. Can be excitatory or inhibitory at the same synapse (depol. or hyperpol. ) 1 neuron secretes nt into ecf . Nt binds to receptors in plasma membrane of a 2bd cell triggering elec. signal may or may not initiate ap. neuroeffector junction - synapse bet. neuron and effector cell. non-neuronal cells can form synapses w/neurons e. g. taste receptor cells in tastebuds. Neuron-neuron synapses, close junctions bet. axon terminal of 1 neuron and plasma memb.