a second nerve impulse cannot be generated until

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. resulting graded potential is called a(n) ________.A) excitatory potential. interior is ________. 1.) Schwann cells are functionally similar to ________. One incoming fiber triggers responses in ever-increasing numbers a) short distance depolarization A) Conducting regionB) Receptive regionC) Secretory Once an action potential has been generated at the axon hillock, it is conducted along the length of the axon until it reaches the terminals, the fingerlike extensions of the neuron that are next to other neurons and muscle cells (see the section The nerve cell: The neuron). The transmission of nerve impulses across chemical synapses is more complex. These electrochemical changes cause depolarization of the membrane resulting in the generation of nerve impulses. Explain how and why an action potential occurs. leakage gated channels A neuron that has as its primary function the job of connecting other neurons is called a(n) ________. Conduction velocity is also affected by myelination of the nerve fibre. Direct-acting neurotransmitters ________. 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"article:topic", "action potential", "synapse", "Resting Potential", "neurotransmitter", "authorname:mgrewal", "showtoc:yes", "nerve impulse", "columns:two", "cssprint:dense", "program:oeri", "licenseversion:30", "license:ck12", "source@https://www.ck12.org/book/ck-12-human-biology/" ], https://bio.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fbio.libretexts.org%2FBookshelves%2FHuman_Biology%2FBook%253A_Human_Biology_(Wakim_and_Grewal)%2F11%253A_Nervous_System%2F11.4%253A_Nerve_Impulses, \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}\) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( 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May be involved in complex, exacting types of mental processing. The Which of the following will occur when an excitatory postsynaptic potential (EPSP) is being generated on the dendritic membrane? The answer involves ions, which are electrically charged atoms or molecules. The first channels to open are the sodium ion channels, which allow sodium ions to enter the cell. Calcium causes synaptic vesicles to fuse with the membrane, releasing their contents into the narrow space between the presynaptic and postsynaptic membranes. the Na+ ions have been pumped back into the cell. 1. B) A single type of channel will open, permitting simultaneous flow of sodium and potassium. d) leakage channel, What is the role of acetylcholinesterase? 50. Which of the following mechanisms is NOT included in the figure? A nerve impulse, like a lightning strike, is an electrical phenomenon. Collections of nerve cell bodies outside the central nervous system are called ________. A second nerve impulse cannot be generated until ____, the membrane potential has been reestablished. 4.) Another factor is the temperature of the nerve fibre. Nerve impulse propagates by jumping from one node of Ranvier to the next. This can be a factor for increasing the speed of nerve impulse from about 30-1 m/ to 90-1 m/s. d) axon, When a sensory neuron is excited by some form of energy, the resulting graded potential is called a(n) ________. ________.A) astrocytes B) microglia C) Schwann cells D) oligodendrocytes. A second nerve impulse cannot be generated until ________. will result in no response in a neuron. 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. The neurotransmitter molecules travel across the synaptic cleft and bind to receptors, which are proteins that are embedded in the membrane of the postsynaptic cell. A stimulus traveling toward a synapse appears to open calcium ion d) act as a transmitting agent, destroy ACh a brief period after its release by the axon endings, Which of the following is false or incorrect? The neurons are said to be in resting phase when there is no nerve impulse. potential has been reestablished. 3.) The rate of transmission and generation of nerve impulses depends upon the type of cell. The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. conduction velocity, Human Anatomy and Physiology, Books a la Carte Edition. analyzes sensory information, stores information, makes decisions. ________ law is the relationship between voltage, current, and resistance. a) mechanically gated channel Select the correct statement regarding synapses. The polarization state is also known as the Unstimulated or non-conductive state. Not ready to purchase the revision kit yet? a) afforestation neuron A neuronal circuit that concentrates or directs a large number of incoming impulses to a rather small number of neurons is called a(n) ________. B) the membrane potential has been reestablished, C) the Na ions have been pumped back into the cell, In what way does the interior surface of a cell membrane of a resting True or false: The all-or-none phenomenon as applied to nerve 16. This is close to the Nernst potential for Na+that is, the membrane potential at which electrochemical equilibrium would be established if the membrane were completely permeable to Na+. c) neurolemma A) the membrane potential has been reestablished B) the Na ions have been pumped back into the cell C) proteins have been resynthesized D) all sodium gates are closed. During the repolarization state, efflux of potassium ions through the potassium channel occurs. Beginning at the resting potential of a neuron (for instance, 75 mV), a local potential can be of any grade up to the threshold potential (for instance, 58 mV). The transmitter molecules are then expelled from the vesicles into the synaptic cleft. negatively charged and contains less sodium. The nerve impulse travels at a speed of 100 m/s in saltatory conduction. Like the receptor potential, the PSP is a graded response, varying in amplitude according to the duration and amount of stimulation by neurotransmitters.

a second nerve impulse cannot be generated until 2023