Brain and Behavior chapter 4
Brain and Behavior chapter 4 Nsci3300
Popular in Brian and behavior
verified elite notetaker
Popular in Psychlogy
This 3 page Class Notes was uploaded by Caoimhe Notetaker on Saturday September 12, 2015. The Class Notes belongs to Nsci3300 at Tulane University taught by Paul Colombo in Summer 2015. Since its upload, it has received 115 views. For similar materials see Brian and behavior in Psychlogy at Tulane University.
Reviews for Brain and Behavior chapter 4
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
Date Created: 09/12/15
Brain and Behavior 09122015 Chapter 4 neural conduction and synaptic condition Membrane potential difference in electrical charge between the inside and the outside of a cell 0 To record must position the tip of one electrode inside the neuron and the other tip outside 0 Microelectrodes intracellular electrode 0 A steady membrane potential of 70mV is resting potential lons Salts lon neural tissue separate into ions 0 Ion transport if performed by mechanisms in the cell membrane that continually exchange 3 NA ions inside for 2 K ions outside 0 These transporters are referred to as sodiumpotassium pumps 0 When neurotransmitter bind to postsynaptic receptors they typically have one of 2 effects 0 Depolarize decrease resting membrane potential excitatory o Hyperpolarize increase resting membrane potential inhibitory action potentials generate in axons initial segment 0 all or nothing responses 0 integration adding or combining a number of different individual signals into one 0 Voltage activated ion channels 0 ion channels that openclose in response to changes in the level of membrane potential produce action potential conduct action potential along axon Refractory periods 0 About 2 seconds after initiation of Action potential AP it is impossible to elicit a 2nCI AP Absolute refractory o Followed by a period where it is possible only when applying higher than normal stimulation relative refractory Neurotransmitters Neuropeptides large neurotransmitters short amino acids chains 336 amino acids 0 Basically a short protein Coexistence neurons with two neurotransmitters 0 Most documented cases of coexistence have included one smallmolecule neurotransmitter and one neuropeptide Exocytosis process of neurotransmitter release Ligand molecule that binds to another Receptor what neurotransmitter molecules bind to to produce signals in postsynaptic neurons De activating mechanisms Two mechanisms for deactivation o Reuptake molecule More common of the two 0 Enzymatic degradation Gap junctions Electrical synapses o Transmit signals more rapidly than chemical synapses Gap junctions have now been documented in virtually all organs and cell types in the body Glia gap junctions play a major role in brain function Neurotransmitter in CNS amino acids 0 Glutamate aspartate glycine and GABA Monoamine neurotransmitters o slightly large than amino acid neurotransmitters and their effects tend to be more diffused catecholamines synthesized from thyrosine n sopamine epinephrine norepinephrine indolamine synthesized from tryprophan a serotonin Acetycholine small molecule neurotransmitter 0 Created by adding an acetyl group to a choline molecule 0 Located at neuromuscularjunctions ANS synapses and some CNS synapses Unconventional neurotransmitter o Easily passes through cell membranes because they are soluble in lipids The actions of each neuropeptide depends of its amino acid sequence Identi ed by where they were 1st identi ed as hormones Pituitary peptide Hypothalamic peptide Braingut peptide Opioid peptide Similar in structure to the active ingredient for opium 5 miscellaneous peptide General steps of neurotransmitters 1 Synthesis of the neurotransmitter 2 storage in vesicles 3 breakdown in the cytoplasm of any neurotransmitter that leaks from vesicles exocytosis inhibitory feedback via autoreceptors activation of postsynaptic receptor deachann gtUUl 39 FP P F
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'