HMB200H1 Chapter Notes - Chapter 3: Inhibitory Postsynaptic Potential, Excitatory Postsynaptic Potential, Electrochemical Gradient

86 views9 pages

marooneagle692

15 Mar 2016

School

Department

Course

Professor

For unlimited access to Textbook Notes, a Class+ subscription is required.

Document Summary

Synapic transmission can be excitaion and inhibiion. A few interconnecions (microcircuit) can mediate relexes and learning and memory: macrocircuits for higher brain funcions (object recogniion) Dendires, soma (has nucleus and organelles), axons (can be up to a meter! ), synapse: synapic clet, neurotransmiters, acion potenial, difusion and binding to post synapse which allows ion channels to change electrical properies, mobilizaion docking fusion release. Resing potenial of cell is -60mv from microeletrode. Post-synapic because the signal is recorded on that side. Need muliple acion potenials for this to happen called temporal summaion to reach threshold. Spaial summaion: area of dendrites receiving synapic contacts. Size of depolarizaion does not afect the size of the acion potenial: all or nothing. Nervous system encodes informaion in terms of the changes in the frequency of pas: the greater the intensity of the simulus the greater the number of aps pulse frequency modulaion.

Related Questions

The junction specialized for the transmission between a neuron and another cell is called a (1) _____ ______. Usually, the signal being sent to the receiving cell is carried by chemical messengers called (2) _____. (3) _____ is an example of this type of chemical messenger, which diffuses across the synaptic cleft, combines with protein receptor molecules on the muscle cell membrane, and soon thereafter is rapidly broken down by enzymes. At an (4) ____ synapse, the membrane potential is driven toward the threshold value and increases the likelihood that depolarization and an action potential will occur. At an (5) ____ synapse, the membrane potential is driven away form the threshold value, and the receiving neuron becomes hyperpolarized and is less likely to achieve an action potential. A specific transmitter substance can have either excitatory or inhibitory effects depending on which type of protein channel it opens up in the (6) ____ membrane. (7) ____ are neuromodulators that inhibit perceptions of pain and may have roles in memory and learning, emotional states, temperature regulation, and sexual behavior. (8) ____ ________ at the cellular level is the moment-by-moment tallying of all excitatory and inhibitory signals acting on a neuron. Incoming information is (9) ____ by the cell bodies, and the charge differences across the membranes are either enhanced or inhibited. Some narrow-diameter neurons are wrapped in lipid-rich (10) _______ produced by specialized neuroglial called Schwann cells; each of these is separated from the next by a(n) (11) ________ ________ - a small gap where the axon is exposed to extracellular fluid. A (12) ____ is an involuntary sequence of events elicited by a stimulus. During a (13) _______ ________, a muscle contracts involuntary whenever conditions cause a stretch in length; many of these help you maintain an upright posture despite small shifts in balance. Imbalances can occur at chemical synapses; a neurotoxin produced by Clostridium tetani blocks the release of GABA and glycine, thus freeing the motor neurons from (14) _____ control, which may cause tetanus â a prolonged, spastic paralysis that can lead to death. A. Excitatory H. Stretch reflex B. Inhibitory I. Summed C. Myelin J. Neurotransmitters D. Chemical synapse K. Postsynaptic E. Synaptic integration L. Endorphins F. Exposed node M. Acetylcholine (ACh)

lilacchinchilla331

HMB200H1 Chapter Notes - Chapter 3: Inhibitory Postsynaptic Potential, Excitatory Postsynaptic Potential, Electrochemical Gradient

Document Summary

Get access

Related Documents

HMB200H1 Chapter Notes - Chapter 4: Glycine Receptor, Voltage Clamp, Stretch Receptor

HMB200H1 Chapter Notes - Chapter 4: Axon Terminal, Axon Hillock, Peripheral Nervous System

BIO 12 Lecture Notes - Lecture 10: Axon Terminal, Neuroglia, Brainstem

Related Questions