Synapse Problems - synaptic cleft which is the gap between...

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Ryan Montour PSY 110: Assignment 6 Question 1: Describe the differences between the myelin sheath that surrounds the axons in the CNS, compared to the myelin sheath that surrounds axons in the PNS. Peripheral Nervous System (PNS) has only one Schwann cell per segment of myelin on a single axon. The depth of myelination is much greater also as the myelin sheath wraps around the axon many times. Oligodendrocyte, unlike Schwann cells of the PNS, form segments of myelin sheaths of numerous neurons at once. Figure 1: The Cholinergic Synapse Question 2: Describe what is occurring at Numbers 1, 2, 3, 4, 5: The Action Potential reaches the terminal bouton and calcium ion enters, the vesicles at Number 2 are now driven away and the acetylcholin e are realized from the presynaptic membrane and release the neurotransmitter into the synapse. At Number 3 the ACh drifts around the
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Unformatted text preview: synaptic cleft which is the gap between the synaptic interactions. At Number 4 the neurotransmitters find postsynaptic receptors and release their signal into the postsynaptic membrane . These transmitters then need to be cleaned up before another response occurs. At Number 5 AcHe, clean the excess ACh through a process called acetylcholine esterase. Question 3: What is the meaning of the statement: The Action Potential is a “ non-decremental, all-or-none ” impulse down the axon of the neuron. The all-or-none characteristic of the action potential means that once a stimulus of threshold intensity is reached, the neuron conducts at the maximum intensity it is capable of at that time. The size of the action potential, then, is not at all related to the intensity of the stimulus...
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This homework help was uploaded on 04/16/2008 for the course PSY 110 taught by Professor Ken during the Spring '08 term at California State University , Monterey Bay.

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