NSC Ch. 5 Study Exam Questions With Correct Answers.

NSC Ch. 5 Study Exam Questions With Correct Answers. synaptic transmission - CORRECT ANSWER process of information transfer at a synapse two types: electrical and chemical electrical synapses - CORRECT ANSWER synaptic transmission via electrical current flowing from one neuron to the next occur through gap junctions that ions pass directly from cytoplasm of one cell to cytoplasm of the other at the junctions, channels called connexons (2 per channel) form gap junction channels that ions pass through transmission is bidirectional and very fast when connected by by gap junctions, said to be electrically coupled AP in the presynaptic neuron causes a small amount of ionic current to flow across the gap junction channels into the other neuron causing PSP chemical synapses - CORRECT ANSWER chemical neurotransmitters transfer information from one neuron to another at the synapse; most presynaptic and postsynaptic membranse separated by synaptic cleft that's filled with a matrix of fibrous extracellular protein presynaptic element usually an axon terminal, which contains dozens of synaptic vesicles inside of which are neurotransmitters and the terminal may also contain secretory vesicles postsynaptic potential (PSP) - CORRECT ANSWER AP caused in the second neuron in an electrically coupled neurons secretory granules - CORRECT ANSWER large vesicles in axon terminals that contain soluble protein that appears dark in the electron microscope also called dense-core vesicles membrane differentiations - CORRECT ANSWER dense accumulations of protein adjacent to and within the membrane on either side of the synaptic cleft active zones - CORRECT ANSWER sites of the neurotransmitter release; located on the presynaptic side postsynaptic density - CORRECT ANSWER the protein thickly accumulated in and just under the postsynaptic membrane contains the neurotransmitter receptors which convert the intercellular chemical signal into an intracellular signal in the postsynaptic cell