a second nerve impulse cannot be generated until

This site is using cookies under cookie policy . Any stimulus below this intensity Name any four of them.. 1.) Which of the choices below describes the ANS? It refers to a graded potential state because a threshold stimulus of about -55mV causes a change in the membrane potential. True or False, A synapse formed between the axon ending of one neuron and the cell body of another neuron is called an axosomatic synapse. This period occurs at the end of action potential and limits the speed at which nerve impulses can be generated in a nerve fibre. B) A single type of channel will open, permitting simultaneous flow of sodium and potassium. negatively charged and contains less sodium. The interior is ________. This period is followed by the return of the neuronal properties to the threshold levels originally required for the initiation of action potentials. If somehow the synaptic gap doesnt allow the passage of nerve impulse, the transmission of nerve impulse will not occur and consequently required response too. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Two factors are essential for the release of the neurotransmitter from the presynaptic terminal: (1) depolarization of the terminal and (2) the presence of calcium ions (Ca2+) in the extracellular fluid. Which of the following mechanisms is NOT included in the figure? (Do not expand to minterm form before plotting.) c) a nerve impulse occurs if the excitatory and inhibitory effects are equal, a nerve impulse occurs if the excitatory and inhibitory effects are equal, A neuron that has as its primary function the job of connecting other neurons is called a(n) ________. The nodes of Ranvier As the flow of current in a wire occurs at a specific voltage only, similarly the conduction of nerve impulse occurs when a stimulus has a maximum threshold value of -55 millivolts. See answer (1) Copy. Opening K+ or Cl- channels in a postsynaptic Which of the following will occur when an excitatory postsynaptic Saltatory conduction increases the speed at which a nerve signal is conducted down the length of an axon. The transmission of nerve impulses across chemical synapses is more complex. In what way does the interior surface of a cell membrane of a resting Since ions cannot cross the lipid content of the myelin sheath, they spread passively down the nerve fibre until reaching the unmyelinated nodes of Ranvier. Sodium is the principal ion in the fluid outside of cells, and potassium is the principal ion in the fluid inside of cells. Nerve Impulse is defined as a wave of electrical chemical changes across the neuron that helps in the generation of the action potential in response to the stimulus. 5.) A) erratic transmission of nerve impulses. For the transmission of a nerve impulse, the stages are below: Before going into the details of the process of nerve impulse transmission, lets first discuss action and resting potential states. { "11.1:_Case_Study:__The_Control_Center_of_Your_Body" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.2:_Introduction_to_the_Nervous_System" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.3:_Neurons" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.4:_Nerve_Impulses" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.5:_Central_Nervous_System" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.6:_Peripheral_Nervous_System" : "property get [Map 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These chemical signals are neurotransmitters. Following sodium inactivation is the opening of potassium channels, which allows the diffusion of K+ out of the cell. True or False, Efferent nerve fibers may be described as motor nerve fibers. The inside of the membrane becomes negative again. The part of a neuron that conducts impulses away from its cell body is called a(n) ________. B) Neurotransmitter receptors are located on the axons terminals of cells. synaptic vesicles to the axonal membrane. 6.) The interior is Negatively charged and contains less sodium It persists for only 2 milliseconds. The membrane of the presynaptic terminal contains voltage-dependent calcium channels that open when the membrane is depolarized by a nerve impulse, allowing Ca2+ to diffuse into the terminal along its concentration gradient. Temperature cause changes in the rate of diffusion of ions across the neuron membrane. C) They can be called postsynaptic potentials. voltage-gated channel Which of the following is true about the movement of ions across excitable living membranes? Saltatory is faster than continuous conduction and occurs in myelinated neurons. As instantaneous as the opening of sodium channels at threshold potential is their closing at the peak of action potential. Determine its coordinate direction angles of the force. Collections of nerve cell bodies outside the central nervous system are called ________. This delay may be accounted for by three factors. buffering potassium and recapturing neurotransmitters are )Area where nerve impulse is generated.2.) Both of the ion channels then close, and the sodium-potassium pump restores the resting potential of -70 mV. In what way does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environment? An inhibitory postsynaptic potential (IPSP) is associated with association neuron. to another stimulus is the ________.A) depolarization, Strong stimuli cause the amplitude of action potentials generated to increase. The answer is 'the membrane potential has been reestablished' Ths occurs by pumping out sodium ions from the inside of the cell. In this manner the action potential jumps quickly from node to node along the fibre in a process called saltatory conduction (from Latin saltare, to jump). ________ is a neurotransmitter of the CNS that is used by Purkinje cells of the CNS. D) the membrane potential has been reestablished.

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