nervous5
... Some ion Channels that allow flux of Na+ and K+ simultaneously e.g. nicotinic Acetylcholine Receptor (nAChR) ...
... Some ion Channels that allow flux of Na+ and K+ simultaneously e.g. nicotinic Acetylcholine Receptor (nAChR) ...
The Nervous System
... ● electrical synapses contain gaps that DO allow electrical current to flow directly from cell to cell ● most synapses are chemical synapses, involving the release of a chemical neurotransmitter by a presynaptic neuron ● then presynaptic neuron synthesizes and packages the neurotransmitter into the ...
... ● electrical synapses contain gaps that DO allow electrical current to flow directly from cell to cell ● most synapses are chemical synapses, involving the release of a chemical neurotransmitter by a presynaptic neuron ● then presynaptic neuron synthesizes and packages the neurotransmitter into the ...
Neurons
... contains synapses neurotransmitters are released in order to communicate with target neurons the membrane of the vesicle fuses with the presynaptic membrane at the synapse the vesicle membrane is recycled ...
... contains synapses neurotransmitters are released in order to communicate with target neurons the membrane of the vesicle fuses with the presynaptic membrane at the synapse the vesicle membrane is recycled ...
Prac T12 - studylib.net
... from the central nervous system to the peripheral nervous system from processing centers in the brain to peripheral receptors from motor pathways to interneurons in the CNS from peripheral receptors to processing centers in the brain Tyson decides to travel overseas but does not have all the require ...
... from the central nervous system to the peripheral nervous system from processing centers in the brain to peripheral receptors from motor pathways to interneurons in the CNS from peripheral receptors to processing centers in the brain Tyson decides to travel overseas but does not have all the require ...
Name: Date: Period: ______ Unit 7, Part 2 Notes: The Nervous
... the cell, lowering the cell’s voltage back to its resting potential (-70 mV). During this stage, voltage-gated Na+ channels also close, so that no more positive charge can enter the cell. Because K+ channels take a long time to close, they let out some excess K+ and cause the membrane potential to d ...
... the cell, lowering the cell’s voltage back to its resting potential (-70 mV). During this stage, voltage-gated Na+ channels also close, so that no more positive charge can enter the cell. Because K+ channels take a long time to close, they let out some excess K+ and cause the membrane potential to d ...
Sending Signals Notes
... taken up again by the axon terminal and recycled, or they may simply diffuse away. • NERVE GAS prevents enzymes from breaking down neurotransmitters, as a result muscles in the respiratory and nervous system becomes paralyzed. ...
... taken up again by the axon terminal and recycled, or they may simply diffuse away. • NERVE GAS prevents enzymes from breaking down neurotransmitters, as a result muscles in the respiratory and nervous system becomes paralyzed. ...
Chapter 9: Nervous System guide—Please complete these notes on
... to resting state (action potential) 19. Describe the resting potential. The undisturbed potential difference in electrical charge between the inside and the outside of the membrane—Higher Potassium inside, Sodium outside ...
... to resting state (action potential) 19. Describe the resting potential. The undisturbed potential difference in electrical charge between the inside and the outside of the membrane—Higher Potassium inside, Sodium outside ...
Psych 9A. Lec. 05 PP Slides: Brain and Nervous System
... • These cells have many functions, both during development and in supporting the function of the mature nervous system. • They may also constitute a separate, slow signal system. • Oligodendrocytes: produce myelin sheaths for neuron axons (white ...
... • These cells have many functions, both during development and in supporting the function of the mature nervous system. • They may also constitute a separate, slow signal system. • Oligodendrocytes: produce myelin sheaths for neuron axons (white ...
ppt
... Synaptic Potentials •Excitatory Postsynaptic Potential (EPSP) •triggered by excitatory neurotransmitters •open ligand-gated Na+ channels •allows Na+ to flow inside the cell •causing a slight depolarization of the postsynaptic cell •moves the postsynaptic cell closer to firing an action potential ...
... Synaptic Potentials •Excitatory Postsynaptic Potential (EPSP) •triggered by excitatory neurotransmitters •open ligand-gated Na+ channels •allows Na+ to flow inside the cell •causing a slight depolarization of the postsynaptic cell •moves the postsynaptic cell closer to firing an action potential ...
5 Action Potential.key
... is no myelin, and there is a high density of sodium and potassium channels • Thus the A.P. is regenerated at nodes of Ranvier • This is called “saltatory” conduction, which means that the A.P. jumps from one node to the next ...
... is no myelin, and there is a high density of sodium and potassium channels • Thus the A.P. is regenerated at nodes of Ranvier • This is called “saltatory” conduction, which means that the A.P. jumps from one node to the next ...
View display copy
... concepts of resting membrane potential and action potential. Resting membrane potential There is always voltage in neurons, even when they’re not transmitting any impulses. This is called the resting membrane potential and is generated by an uneven trade of Na+ and K+ ions. There are more K+ ions th ...
... concepts of resting membrane potential and action potential. Resting membrane potential There is always voltage in neurons, even when they’re not transmitting any impulses. This is called the resting membrane potential and is generated by an uneven trade of Na+ and K+ ions. There are more K+ ions th ...
PowerPoint
... taken up again by the axon terminal and recycled, or they may simply diffuse away. • NERVE GAS prevents enzymes from breaking down neurotransmitters, as a result muscles in the respiratory and nervous system becomes paralyzed. ...
... taken up again by the axon terminal and recycled, or they may simply diffuse away. • NERVE GAS prevents enzymes from breaking down neurotransmitters, as a result muscles in the respiratory and nervous system becomes paralyzed. ...
Passive Conduction - Cable Theory
... Suppose we have two dendritic branches coming to a union as a model system. We want to investigate the outcome of two different synaptic pulses coming together. The pulse on the top branch inititiates at a point which is an arc length of a from the union while the bottom branch’s pulse begins at an ...
... Suppose we have two dendritic branches coming to a union as a model system. We want to investigate the outcome of two different synaptic pulses coming together. The pulse on the top branch inititiates at a point which is an arc length of a from the union while the bottom branch’s pulse begins at an ...
Basic cellular physiology and anatomy, general
... move towards the periphery of the cell and upon stimulation, their membranes fuse with the cell membrane, and their protein load is exteriorized. Processing of the contained protein may take place in secretory granules. Comment Note that the term 'secretory vesicle' is sometimes used in this sense, ...
... move towards the periphery of the cell and upon stimulation, their membranes fuse with the cell membrane, and their protein load is exteriorized. Processing of the contained protein may take place in secretory granules. Comment Note that the term 'secretory vesicle' is sometimes used in this sense, ...
Nervous System and Senses - Avon Community School Corporation
... All-or-none- neuron does not react until a threshold stimulus is applied, but once ...
... All-or-none- neuron does not react until a threshold stimulus is applied, but once ...
Neural Conduction - U
... • At the same time, voltage-gated K+ channels slowly begin to open. Most of these channels open at about the time that the membrane potential is about +50mV. At this point, K+ ions are driven out by the +50mV charge and by their high internal concentration; this repolarizes the neuron and leaves it ...
... • At the same time, voltage-gated K+ channels slowly begin to open. Most of these channels open at about the time that the membrane potential is about +50mV. At this point, K+ ions are driven out by the +50mV charge and by their high internal concentration; this repolarizes the neuron and leaves it ...
Unit 8 Nervous System
... When gated channels are open Ions diffuse quickly across the membrane along their electrochemical gradients Chemical gradients go from high to low Electrical gradients go from low to high ...
... When gated channels are open Ions diffuse quickly across the membrane along their electrochemical gradients Chemical gradients go from high to low Electrical gradients go from low to high ...
Chapter 48: Nervous Systems Overview: Command and Control
... The concentration of Na+ is higher in the extracellular fluid than in the cytosol while the opposite is true for K+ • A neuron that is not transmitting signals contains many open K+ channels and fewer open Na+ channels in its plasma membrane • The diffusion of K+ and Na+ through these channels leads ...
... The concentration of Na+ is higher in the extracellular fluid than in the cytosol while the opposite is true for K+ • A neuron that is not transmitting signals contains many open K+ channels and fewer open Na+ channels in its plasma membrane • The diffusion of K+ and Na+ through these channels leads ...
Psych 11Nervous System Overview
... Step 4: Neurotransmitters diffuse across the synaptic cleft (a very short distance) and bind to receptor proteins on the postsynaptic membrane. Excitatory neurotransmitters cause sodium ions to move through receptor proteins depolarizing the membrane. Inhibitory neurotransmitters do not depolarize ...
... Step 4: Neurotransmitters diffuse across the synaptic cleft (a very short distance) and bind to receptor proteins on the postsynaptic membrane. Excitatory neurotransmitters cause sodium ions to move through receptor proteins depolarizing the membrane. Inhibitory neurotransmitters do not depolarize ...
the nervous sys. The function of neuron & Glia
... 1. After a train of APs the nerve has gained some Na and lost some K. To make sure the ion concentrations recover to their original quantities, a Na/K pump within the membrane moves Na out and K in. Because the pump is moving ions against their concentration gradients requires energy (breakdown of s ...
... 1. After a train of APs the nerve has gained some Na and lost some K. To make sure the ion concentrations recover to their original quantities, a Na/K pump within the membrane moves Na out and K in. Because the pump is moving ions against their concentration gradients requires energy (breakdown of s ...
Neurons
... Positively charged potassium and sodium and negatively charged chloride ions flow back and forth across the cell membrane, but do NOT cross at the same rate HIGHER CONCENTRATION of negatively charged ions inside the cell------ resulting voltage/potential energy RESTING POTENTIAL- stable, nega ...
... Positively charged potassium and sodium and negatively charged chloride ions flow back and forth across the cell membrane, but do NOT cross at the same rate HIGHER CONCENTRATION of negatively charged ions inside the cell------ resulting voltage/potential energy RESTING POTENTIAL- stable, nega ...
Nervous System
... • Once the neuron’s membrane is depolarized to the threshold level, an action potential occurs. • An electrical signal travels via the axon to the next neuron. – At the end of the axon, the signal causes the release of neurotransmitters that jump the space between cells called the synapse ...
... • Once the neuron’s membrane is depolarized to the threshold level, an action potential occurs. • An electrical signal travels via the axon to the next neuron. – At the end of the axon, the signal causes the release of neurotransmitters that jump the space between cells called the synapse ...
Resting potential
The relatively static membrane potential of quiescent cells is called the resting membrane potential (or resting voltage), as opposed to the specific dynamic electrochemical phenomena called action potential and graded membrane potential.Apart from the latter two, which occur in excitable cells (neurons, muscles, and some secretory cells in glands), membrane voltage in the majority of non-excitable cells can also undergo changes in response to environmental or intracellular stimuli. In principle, there is no difference between resting membrane potential and dynamic voltage changes like action potential from a biophysical point of view: all these phenomena are caused by specific changes in membrane permeabilities for potassium, sodium, calcium, and chloride ions, which in turn result from concerted changes in functional activity of various ion channels, ion transporters, and exchangers. Conventionally, resting membrane potential can be defined as a relatively stable, ground value of transmembrane voltage in animal and plant cells.Any voltage is a difference in electric potential between two points—for example, the separation of positive and negative electric charges on opposite sides of a resistive barrier. The typical resting membrane potential of a cell arises from the separation of potassium ions from intracellular, relatively immobile anions across the membrane of the cell. Because the membrane permeability for potassium is much higher than that for other ions (disregarding voltage-gated channels at this stage), and because of the strong chemical gradient for potassium, potassium ions flow from the cytosol into the extracellular space carrying out positive charge, until their movement is balanced by build-up of negative charge on the inner surface of the membrane. Again, because of the high relative permeability for potassium, the resulting membrane potential is almost always close to the potassium reversal potential. But in order for this process to occur, a concentration gradient of potassium ions must first be set up. This work is done by the ion pumps/transporters and/or exchangers and generally is powered by ATP.In the case of the resting membrane potential across an animal cell's plasma membrane, potassium (and sodium) gradients are established by the Na+/K+-ATPase (sodium-potassium pump) which transports 2 potassium ions inside and 3 sodium ions outside at the cost of 1 ATP molecule. In other cases, for example, a membrane potential may be established by acidification of the inside of a membranous compartment (such as the proton pump that generates membrane potential across synaptic vesicle membranes).