________ is a neurotransmitter of the CNS that is used by Purkinje cells of the CNS. B) Neurotransmitter receptors are located on the axons terminals of cells. after-discharge circuitD) Converging circuit, Cell bodies of sensory neurons may be located in ganglia lying d) leakage channel, What is the role of acetylcholinesterase? In what way does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environment? The ions may attach to the membranes of synaptic vesicles, in some way facilitating their fusion with the nerve terminal membrane. C) motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands. 16. A second nerve impulse cannot be generated until - BRAINLY The sequence of sodium activationsodium inactivationpotassium activation creates a nerve impulse that is brief in duration, lasting only a few milliseconds, and that travels down the nerve fibre like a wave, the membrane depolarizing in front of the current and repolarizing behind. 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. The sodium-potassium pump moves both ions from areas of lower to higher concentration, using energy in ATP and carrier proteins in the cell membrane. Nerve impulse was discovered by British Scientist Lord Adrian in the 1930s. What is the role of acetylcholinesterase? spinal cord? The combined effect of sodium inactivation, which blocks the influx of cations, and potassium activation, which causes the efflux of other cations, is the immediate return of the cell membrane to a polarized state, with the inside negative in relation to the outside. B) the impulse would spread bidirectionally. It is a static state and both the sodium and potassium channels are closed during this state maintaining a high concentration of sodium ions outside and high potassium ions concentration inside the cell. As is stated above, the lipid bilayer of the neuronal membrane tends to repel electrically charged, hydrated ions, making virtually impossible the movement across the membrane that is necessary for the generation of nerve impulses. Synaptic cleft. A) Reverberating circuitB) Diverging circuitC) Parallel It is a short duration of time during which a new nerve impulse cannot be generated in a neuron, after initiation of a previous action potential. True or False, During depolarization, the inside of the neuron's membrane becomes less negative. returned it's base level or even more negative. The part of a neuron that conducts impulses away from its cell body is called a(n) ________. 4.) The neuron is either at rest with a polarized membrane, or it is conducting a nerve impulse at reverse polarization. A nerve impulse is similar to a lightning strike. (Do not expand to minterm form before plotting.) True or False, Action potentials can be generated by virtually all cells of the body because all cells possess cell membranes. Plasma membrane exhibits voltage-gated Na+ and K+ channels. d) motor fibers that conduct nerve impulses from the CNS to skeletal muscles, motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands, Saltatory conduction is made possible by ________. Free Flashcards about Chapter 11 A&P - StudyStack The nerve impulse travels at a speed of 100 m/s in saltatory conduction. The action potential is +40 mV. Vesicle membranes are then recovered from the plasma membrane through endocytosis. This area is called the synaptic cleft. D) Group C fibers are not capable of saltatory conduction. )Which neuron is a sensory neuron found in a reflex arc? In this process the membranes are surrounded by a protein coat at the lateral margins of the synapse and are then transferred to cisternae, which form in the terminal during nerve stimulation. interior is ________.A) negatively charged and contains less sodium, B) positively charged and contains less sodium, C) negatively charged and contains more sodium, D) positively charged and contains more sodium, If a motor neuron in the body were stimulated by an electrode placed (See the figure.) This reverse polarity constitutes the nerve impulse. The role of acetylcholinesterase is to ________. Nerve impulse propagates by jumping from one node of Ranvier to the next. a) destroy ACh a brief period after its release by the axon endings True or False, A stimulus traveling toward a synapse appears to open calcium channels at the presynaptic end, which in turn promotes fusion of synaptic vesicles to the axonal membrane. Schwann cells are functionally similar to ________. Stimulation of a if the ventral nerve root of a spinal is never destroyed a person would lose.. . The first factor is the outside diameter of the nerve fibre. the membrane potential has been reestablished. The interior is: lower 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). The sodium and potassium ATPase pump, driven by using ATP, helps to restore the resting membrane state for the conduction of a second nerve impulse in response to the other stimulus. b) ligand-gated channel B) Sodium gates will open first, then close as potassium gates open. Figure \(\PageIndex{3}\)shows in greater detail how the sodium-potassium pump works. Until potassium channels close, the number of potassium ions that have moved across the membrane is enough to restore the initial polarized potential state. When a sensory neuron is excited by some form of energy, the resulting graded potential is called a(n) ________. In order a nerve impulse to be generated there needs to be a stimulus. An impulse from one nerve cell is communicated to another nerve cell via the ________. Chapter 11 Flashcards - Easy Notecards Collections of nerve cell bodies outside the central nervous system A nerve impulse, like a lightning strike, is an electrical phenomenon. A stimulus would be you burning your finger or bumping your arm. At this point there exist two methods for transmitting the action potential from one cell to the other. Therefore, repolarization helps in maintaining or restoring the original membrane potential state. Synaptic vesicles. A neuron that has as its primary function the job of connecting other neurons is called a(n) ________. In electrical synapses, two neurons are connected through channel proteins for transmitting a nerve impulse. d) generator potential, Which of the following describes the excitatory postsynaptic potential? What is the expected frequency of heterozygotes in the progeny of the self-fertilized plants? 15. a single depolarization. (c) Find the minimum product of sums. Other neurons have a) mechanically gated channel 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) ________. Chapter 11 Flashcards | Chegg.com This site is using cookies under cookie policy . What does the central nervous system use to determine the strength of a stimulus? 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). Which ion channel opens in response to a change in membrane potential and participates in generation and conduction of action potentials? A) The release of neurotransmitter molecules gives cells the property of being electrically coupled. phase labeled D? True or False, The nodes of Ranvier are found only on myelinated, peripheral neural processes. A second nerve impulse cannot be generated until when? However, the velocity of conduction along the nerve fibre is dependent upon several factors. During the resting state, the sodium-potassium pump maintains a difference in charge across the cell membrane of the neuron. happen after a refractory period, when the membrane potential has ________.A) astrocytes B) microglia C) Schwann cells D) oligodendrocytes. In what way does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environment? In myelinated neurons, ion flows occur only at the nodes of Ranvier. 3.) 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? conduction to take place. 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. Join over 22,000 learners who have passed their exams thanks to us! Figure \(\PageIndex{4}\)shows the change in potential of the axon membrane during an action potential. Which of the following describes the excitatory postsynaptic potential? How does this difference in electrical charge come about? May be involved in complex, exacting types of mental processing. In a reflex arc, which neuron has its cell body inside the A second nerve impulse cannot be generated until ________. Which of the following will occur when an excitatory postsynaptic potential (EPSP) is being generated on the dendritic membrane? B) stimulate the production of acetylcholine, C) destroy ACh a brief period after its release by the axon endings. These sites have the advantage of being readily accessible for recording by electrodesespecially the squid synapse, which is large enough that electrodes can be inserted directly into the presynaptic terminal and postsynaptic fibre. Tecle, with a mass of 65.0 kg, is standing by the boards at the side of an ice skating rink. 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. analyzes sensory information, stores information, makes decisions.
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