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). Saltatory conduction is made possible by ________. When a stimulus is applied to resting membrane, sodium ions freely pass inside the cell and membrane is now said to be in depolarized phase. The nerve impulse travels at a speed of 100 m/s in saltatory conduction. What does the central nervous system use to determine the strength of a stimulus? True or False, Enkephalins and endorphins are peptides that act like morphine. B) are crucial in the production of neurotransmitters, C) are crucial for the development of neural connections. 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The action potential travels along the entire length of the axon. The nerve goes through a brief refractory period before racing resting potential. True or False, Strong stimuli cause the amplitude of action potentials generated to increase. 11.4: Nerve Impulses - Biology LibreTexts Does Berkekey accept transcripts with a W on it. Which of the following is not a structural feature of a neuron? Potassium ion channels then open, allowing potassium ions to flow out of the cell, which ends the action potential. frequency of action potentials 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. As stated above, the action potential is propagated along the axon without any decrease in amplitude with distance. The period after an initial stimulus when a neuron is not sensitive to another stimulus is the ________. A second nerve impulse cannot be generated until: the refractory period: In what way does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environment? A) the membrane potential has been reestablished. The interior is ________. Free Flashcards about ap chap 11 - StudyStack This is due to a clustering of Na+ and K+ ion channels at the Nodes of Ranvier. Postsynaptic membrane. After transmitting from one neuron to another, the nerve impulse generates a particular response after reaching the target site. The generation of a second action in some neurons can only This makes the process of nerve impulse faster as the nerve impulse does not travel the entire length of the axon ( this happens in case of continuous conduction). 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) ________. When information is delivered within the CNS simultaneously by different parts of the neural pathway, the process is called ________ processing. When the voltage has the required number of electron particles it conducts current. May be involved in complex, exacting types of mental processing. (nonconducting) neuron differ from the external environment? The term central nervous system refers to the ________. Synaptic cleft. When a neuron is not actively transmitting a nerve impulse, it is in a resting state, ready to transmit a nerve impulse. The action potential will move down the axon toward the synapse like a wave would move along the surface of the water. The change in membrane potential results in the cell becoming depolarized. This makes the process of nerve impulse faster as the nerve impulse does not travel the entire length of the axon ( this happens in case of continuous conduction). Which of the following describes the nervous system integrative function? a. a) Schwann cell A) The synaptic cleft prevents an impulse from being transmitted directly from one neuron to another. intervals exert a cumulative effect. the same ultimate effect. What is the role of acetylcholinesterase? The nerve impulse travels at a speed of 100 m/s in saltatory conduction. Both a nerve impulse and a lightning strike occur because of differences in electrical charge, and both result in an electric current. answer choices all sodium gates are closed proteins have been resynthesized the Na ions have been pumped back into the cell the membrane potential has been reestablished Question 2 30 seconds Q. 1. The interior is: lower An action potential works on an all-or-nothing basis. It persists for only 2 milliseconds. Figure \(\PageIndex{4}\)shows the change in potential of the axon membrane during an action potential. the neuron cannot respond to a second stimulus, no matter how strong: absolute refractory period: . This Myelin sheath has regular gaps, where it is not present, called nodes of Ranvier. 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. voltage-gated channel You can see in Figure \(\PageIndex{4}\) that two depolarizations did not reach the threshold level of -55mV. Which is by far the most common neuron type? D) pumps three sodium ions outside the cell and two potassium ions inside. A) the myelin sheath b) association neuron Legal. If a membrane depolarization does not reach the threshold level, an action potential will not happen. C) Specific sodium gates will open. 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. In myelinated neurons, ion flows occur only at the nodes of Ranvier. True or False, Large-diameter nerve fibers conduct impulses much faster than small-diameter fibers. Nerve impulse propagates by jumping from one node of Ranvier to the next. They may also be removed from the terminal by exchange with extracellular Na+a mechanism known to occur at some neuronal membranes. In conducting nerve impulse, the following play a major role: Axon plays a major role in the process by transmitting signals in the form of nerve impulses via synapses to the target cells. b) an excitatory postsynaptic potential occurs if the excitatory effect is greater than the inhibitory effect but less than threshold returned it's base level or even more negative. What is the role of acetylcholinesterase? Which neuron would be found in the retina of the eye? 0.80.80.8 liters A&P ch 11 quiz - Subjecto.com are crucial for the development of neural connections. Direct diffusion of ions through these junctions allows the action potential to be transmitted with little or no delay or distortion, in effect synchronizing the response of an entire group of neurons. What type of chemicals are used in sanitation? Chapter 11 Fundamentals of the Nervous System and - FreezingBlue During the repolarization state, efflux of potassium ions through the potassium channel occurs. Nerve cell adhesion molecules (N-CAMs) ________. B) Neurotransmitter receptors are located on the axons terminals of cells. Collections of nerve cell bodies outside the central nervous system Some receptors are ion channels that open or close when their molecular configuration is altered by the binding action of the neurotransmitter. An action potential occurs when the nerve cell is in an excited state while conducting nerve impulses. The period after an initial stimulus when a neuron is not sensitive to another stimulus is the ________. The stimulus can be a chemical, electrical, or mechanical signal. 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. b) dendrite Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle?
