a) sodium gates in the membrane can open in response to electrical potential changes Strong stimuli cause Study now. 50. a) short distance depolarization In electrical synapses, the synaptic gap is about 0.2nm which also favors faster nerve impulse conduction. During depolarization, as impulse is carried across the cell, sodium ions channels open and the sodium outside of the cell enters the cell. c) ions always move actively across membranes through leakage channels d) moves membrane potential away from threshold, Collections of nerve cell bodies outside the central nervous system are called ________. The reverse polarity of active neurons is measured at about +30 mV. True or False, Enkephalins and endorphins are peptides that act like morphine. As a result of the opening of potassium voltage-gated channels, sodium voltage-gated channels will be closed. One incoming fiber triggers responses in ever-increasing numbers Write a method in Java to extract the prefix of an address (as an integer) given a string representing a CIDR notation in the form x.y.z.t/n. If the stimulus is more than the threshold value, then it will generate a nerve impulse that will travel across the entire length of the axon. When information is delivered within the CNS simultaneously by different parts of the neural pathway, the process is called ________ processing. a stimulus? second nerve impulse cannot be generated until proteins have been resynthesized the na ions DismissTry Ask an Expert Ask an Expert Sign inRegister Sign inRegister Home A) Subthreshold stimulusB) Temporal summationC) Spatial ________.A) astrocytes B) microglia C) Schwann cells D) oligodendrocytes. Neurophysiology Practice #2 - A second nerve impulse cannot be generated until ________. Which of the following describes the nervous system integrative function? These chemical signals are neurotransmitters. What type of chemicals are used in sanitation? are found only on myelinated, peripheral neuron processes. Involved in control of rhythmic activities such as breathing. In what way does the interior surface of a cell membrane of a resting d) axon, When a sensory neuron is excited by some form of energy, the resulting graded potential is called a(n) ________. Temperature cause changes in the rate of diffusion of ions across the neuron membrane. Seeley's Essentials of Anatomy and Physiology, Andrew Russo, Cinnamon VanPutte, Jennifer Regan, EXAM 2 Q's and A's from other persons test, three half-lives sc.7.L.15.2. Select the correct statement regarding synapses. (See the figure.) A) They increase amplitude as they move away from the stimulus point. This reverse polarity constitutes the nerve impulse. c) the relapse of neurotransmitter molecules gives cells the property of being electrically coupled This is called the absolute refractory period, and it is followed by a relative refractory period, during which another action potential can be generated, but only by a greater stimulus current than that originally needed. b) dendrite Other neurons have 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. the biceps muscle. 33) A second nerve impulse cannot be generated until _____. True or False, Efferent nerve fibers may be described as motor nerve fibers. A second nerve impulse cannot be generated until ____ the membrane potential has been reestablished Saltatory conduction is made possible by ________. membrane would produce an inhibitory postsynaptic potential (IPSP). Select the correct answer for the following question: The nerve impulse travels at a speed of 100 m/s in saltatory conduction. D) erratic transmission of nerve impulses. What generally determines the effects of a neurotransmitter on a postsynaptic cell? Saltatory conduction is made possible by ________. Each vesicle contains thousands of neurotransmitter molecules, and there are thousands of vesicles in each axon terminal. Owning to the importance of this discovery, he was awarded Noble Prize in 1932. 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 the membrane potential has been reestablished Immediately after an action potential has peaked, which cellular gates open? The interior is ________. An inhibitory postsynaptic potential (IPSP) is associated with ________. ________. At the threshold, voltage-dependent sodium channels become fully activated, and Na+ pours into the cell. That part of the nervous system that is voluntary and conducts impulses from the CNS to the skeletal muscles is the ________ nervous system. The synapse more common in embryonic nervous tissue than in adults is the ________. The nodes of Ranvier membrane exhibits chemically gated ion channels. An action potential occurs when the nerve cell is in an excited state while conducting nerve impulses. A teacher walks into the Classroom and says If only Yesterday was Tomorrow Today would have been a Saturday Which Day did the Teacher make this Statement? It can be generated when a neurons membrane potential is changed by chemical signals from a nearby cell. Quiz Chapter 11 Quiz - Quizizz Schwann cells are functionally similar to ________. 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. Depolarization The specific period during which potassium ions diffuse out of the neuron due to a change in membrane permeability. Explain how and why an action potential occurs. Hence, more time is taken in generating and then transmitting nerve impulses during an action potential. a single type of channel will open, permitting simultaneous flow of sodium and potassium. Which of these ions is actively transported through the cell membrane to establish a resting potential? 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. It is a condition during which the electrical balance is restored inside and outside the axon membrane. A) proteins have been resynthesized B) all sodium gates are closed C) the Na ions have been pumped back into the cell D) the membrane potential has been reestablished A) are crucial for the development of neural connections. They increase amplitude as they move away from the stimulus point. Any distraction in this process can have drastic effects on the body. Therefore, repolarization helps in maintaining or restoring the original membrane potential state. This page titled 11.4: Nerve Impulses is shared under a CK-12 license and was authored, remixed, and/or curated by Suzanne Wakim & Mandeep Grewal via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request. (nonconducting) neuron differ from the external environment? Which of the following is not a function of astrocytes? The fastest conduction velocity occurs in the largest diameter nerve fibres. Which of the following will occur when an excitatory postsynaptic will result in no response in a neuron. 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. An excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle is ________. The part of a neuron that conducts impulses away from its cell body is called a(n) ________. central processes. True or False, Action potentials can be generated by virtually all cells of the body because all cells possess cell membranes. 6.) In electrical transmission, the ionic current flows directly through channels that couple the cells. A) The release of neurotransmitter molecules gives cells the property of being electrically coupled. This method of transmitting nerve impulses, while far less common than chemical transmission, occurs in the nervous systems of invertebrates and lower vertebrates, as well as in the central nervous systems of some mammals. d) generator potential, Which of the following describes the excitatory postsynaptic potential? Relative refractory period An exceptionally strong stimulus can trigger a response Repolarization The specific period during which potassium ions diffuse out of the neuron due to a change in membrane permeability. The PSP is a type of local potential, having properties similar to the electrical potential set up at sensory receptor neurons (see the section Transmission in the neuron: Localized potential). Why was the decision Roe v. Wade important for feminists? insufficient stimulus. Second, they are taken back into the presynaptic terminal by transmitter-sensitive transport molecules. c. 1.21.21.2 liters The flow of which type of ion into the neuron results in an action potential? a) afforestation neuron The resting membrane potential refers to the non-excited state of the nerve cell at rest when no nerve impulse is being conducted. The polarization state is also known as the Unstimulated or non-conductive state. 1.) An association neuron. C) help to circulate the cerebrospinal fluid. Which of the following is correct? 3.) An action potential can form at these gaps and impulse will jump from node to node by saltatory conduction. A Continuous conduction requires more energy to transmit impulses and is a slower process (approximately 0.1 m/s). d) efferent neuron, What are ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid called? Almost instantly the membrane actually reverses polarity, and the inside acquires a positive charge in relation to the outside. What is the resting potential of a neuron, and how is it maintained? Which of the following describes the excitatory postsynaptic potential? Which of the following is a good example of a neuromodulator? A-level Biology focuses on providing students, tutors and teachers with detailed revision materials for A-Level Biology. C) The synaptic cleft prevents an impulse from being transmitted Neuralgia that control the chemical environment around neurons by buffering potassium and recapturing neurotransmitters are. b) association neuron 2.) Chapter 11 Flashcards | Chegg.com True or False, The oligodendrocytes can myelinate several axons. 5.) This results in a huge influx of sodium ions inside the cells which trigger the nerve impulse conduction. 0.80.80.8 liters In electrical synapses, two neurons are connected through channel proteins for transmitting a nerve impulse. zoneD) Secretory regionE) Trigger zone. The first channels to open are the sodium ion channels, which allow sodium ions to enter the cell. In addition, only a single synapse is involved at these sites, whereas a single neuron of the central nervous system may have many synapses with many other neurons, each with a different neurotransmitter. These are nerve impulses that jump from one node to another and are seen only in myelinated nerve fibres. When the buildup of charge was great enough, a sudden discharge of electricity occurred. The frequencies of the alleles A and a are 0.60.60.6 and 0.40.40.4, respectively, in a particular plant population. c) short distance hyperpolarization What is certain is that when the concentration of Ca2+ is increased within the terminal, the probability of transmitter release is also increased. c) voltage-gated channel A second nerve impulse cannot be generated until ________. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. A&P Ch 11 Flashcards | Quizlet Select the correct statement regarding synapses. Schwann cells are functionally similar to ________. C) brain, spinal cord, and peripheral nerves, Which of the following neurotransmitters inhibits pain and is Conduction velocity is also affected by myelination of the nerve fibre. d) leakage channel, What is the role of acetylcholinesterase? Neurons help in transmitting signals in the form of a nerve impulse from the Central nervous system to the peripheral body parts. How does this difference in electrical charge come about? A neurotransmitter might excite one set of target cells, inhibit others, and have complex modulatory effects on still others, depending on the type of receptors. As instantaneous as the opening of sodium channels at threshold potential is their closing at the peak of action potential. An inhibitory postsynaptic potential (IPSP) is associated with As the axon diameter increase, the speed of nerve impulses increases as well. Which of the following describes the nervous system integrative function? The substance released at axon terminals to propagate a nervous impulse is called a(n) ________. B) increase amplitude as they move away from the stimulus point. b) ions always move passively across membranes Direct-acting neurotransmitters ________. channels at the presynaptic end, which in turn promotes fusion of First, the neurotransmitter molecules simply diffuse out of the narrow synaptic cleft. Which of the following is not true of graded potentials? What does the central nervous system use to determine the strength of a stimulus? 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. Involved in activating fibers of a skeletal muscle such as Both of the ion channels then close, and the sodium-potassium pump restores the resting potential of -70 mV. This problem has been solved! Due to this, a difference in electrical potential is generated across the membrane, known as nerve impulse or action potential.
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