SPLH 620 Exam 1 Questions and Answers 100% Correct(SCORED A+)

3 types of neuroglia - ANSWER-astrocytes, oligodendrocytes, microglia Astrocytes CNS - ANSWER-Clean up local debris including dead neurons Provide nutrients Regulate chemical composition of extracellular fluid Oligodendrocytes CNS - ANSWER-Provide support for axons Produce myelin sheath to cover axons (on neuron) in CNS, covering multiple at a time Schwann Cells PNS - ANSWER-Support cells Produce myelin to cover axons (on neuron) in PNS, only covers one axon at a time Each cell provides myelin for one neuron What is exocytosis? - ANSWER-presynaptic process - when the synaptic vesicles are released and fuse to membrane Depolarization - ANSWER-Becomes more positive leading to action potential -70 to -55 Hyperpolarization - ANSWER-membrane potential becomes more negative, less likely for action potential -120 Spatial summation - ANSWER-*multiple* synapses firing at *different* locations at *one time* to create a net effect. Temporal Summation - ANSWER-Transmit impulses in rapid-fire order Process of chemical synapse - ANSWER-Transmission of AP toward axon terminal Opening of Ca++ channels Exocytosis Neurotransmitter binding Opening of Na+ and/or K+ channels Generation of PSP Acetylcholine - ANSWER-excitatory Glutamate - ANSWER-*most abundant* excitatory GABA - ANSWER-*most abundant* in