a second nerve impulse cannot be generated until
(B). A gap between Schwann cells in the peripheral system is called a(n) ________. ________ potentials are short-lived, local changes in membrane potential that can be either depolarized or hyperpolarized. d) oligodendrocytes, David N. Shier, Jackie L. Butler, Ricki Lewis, Charles Welsh, Cynthia Prentice-Craver, David Shier, Jackie Butler, Ricki Lewis, Human Anatomy and Physiology Laboratory Manual (Main Version). Which of the following describes the nervous system integrative function? Neurons are a complex network of fibers that transmit information from the axon ending of one neuron to the dendrite of another neuron. The frequencies of the alleles A and a are 0.60.60.6 and 0.40.40.4, respectively, in a particular plant population. The place where an axon terminal meets another cell is called a synapse. synaptic vesicles to the axonal membrane. These tiny electrical events, called miniature end-plate potentials (MEPPs), or miniature postsynaptic potentials (MPSPs), are caused by the random release of single quanta of neurotransmitter from a resting presynaptic terminal. In order a nerve impulse to be generated there needs to be a stimulus. the membrane potential has been reestablished. 4.) Neuroglia that control the chemical environment around neurons by Which result of the stimulus applied is the likely cause of the potential has been reestablished. The substance released at axon terminals to propagate a nervous impulse is called a(n) ________. Ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid are called ________. Neurons help in transmitting signals in the form of a nerve impulse from the Central nervous system to the peripheral body parts. 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 concentrated at the nodes of Ranvier. helping to determine capillary permeability, Which of the following is not a chemical class of neurotransmitters? May be involved in complex, exacting types of mental processing. to another stimulus is the ________.A) depolarization, Strong stimuli cause the amplitude of action potentials generated to increase. contraction would occur, D) the impulse would spread bidirectionally. b) ions always move passively across membranes The interior is ________. phase labeled D? cord and sensory ganglia of cranial nerves? Another factor is the temperature of the nerve fibre. Sodium is the principal ion in the fluid outside of cells, and potassium is the principal ion in the fluid inside of cells. This helps in maintaining the membrane potential and thus favors faster nerve impulses. the membrane potential has been re-established: During the resting state, the sodium-potassium pump maintains a difference in charge across the cell membrane of the neuron. Which of the following correctly describes a graded potential? 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. The first factor is the outside diameter of the nerve fibre. Some receptors are ion channels that open or close when their molecular configuration is altered by the binding action of the neurotransmitter. Once stimulated by Ca2+, the vesicles move through the cytoplasm and fuse their membranes with the plasma membrane of the terminal. A) Subthreshold stimulusB) Temporal summationC) Spatial In what way does the interior surface of a cell membrane of a resting (nonconducting) . 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. and participates in the generation and conduction of action c) glial cell A single type of channel will open, permitting simultaneous flow of A) They increase amplitude as they move away from the stimulus point. b) amplify or enhance the effect of ACh Others are membrane proteins that, upon activation, catalyze second-messenger reactions within the postsynaptic cell; these reactions in turn open or close the ion channels. Due to this sheath, an action potential is not formed on the surface of the neuron. Write a balanced nuclear equation for the alpha decay of americium-241. This is where the transmission of a nerve impulse to another cell occurs. 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. Axon terminals release neurotransmitters. This area is called the synaptic cleft. Due to the high concentration of sodium ions inside the axoplasm, the potassium channels will open. What does this flow of ions do to the relative charge inside the neuron compared to the outside. In electrical transmission, the ionic current flows directly through channels that couple the cells. the neuron cannot respond to a second stimulus, no matter how strong: absolute refractory period: . A neuronal circuit that concentrates or directs a large number of incoming impulses to a rather small number of neurons is called a(n) ________. A second nerve impulse cannot be generated until: proteins have been resynthesized. True or False, Acetylcholine is not a biogenic amine. As a result, the action potential signal "jumps" along the axon membrane from node to node rather than spreading smoothly along the membrane, as they do in axons that do not have a myelin sheath. When a sensory neuron is excited by some form of nerdy, the resulting graded potential is called a(n) ____, If a motor neuron in the body were stimulated by an electrode placed about midpoint along the length of the axon _____. This leaves 0.30 to 3.80 milliseconds for other processes. True or False, During depolarization, the inside of the neuron's membrane becomes less negative. c) the relapse of neurotransmitter molecules gives cells the property of being electrically coupled The point at which an impulse from one nerve cell is communicated to another nerve cell is the ________. a) an inhibitory postsynaptic potential occurs if the inhibitory effect is greater than the excitatory, causing hyperpolarization of the membrane Select the correct statement regarding synapses. A stimulus traveling toward a synapse appears to open calcium ion A) lowering the threshold for an action potential to occur. Saltatory conduction increases the speed at which a nerve signal is conducted down the length of an axon. summationD) Threshold stimulus, The nodes of Ranvier are found only on myelinated, peripheral neuron processes. 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. In what way does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environment? 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. 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 after-discharge circuitD) Converging circuit, Cell bodies of sensory neurons may be located in ganglia lying This process is called repolarization. through voltage-gated channels. Because the neurotransmitter chemicals are packed into separate, almost identically sized vesicles, their release into the synaptic cleft is said to be quantalthat is, they are expelled in parcels, each vesicle adding its contents incrementally to the contents released from other parcels. A) motor neurons Saltatory conduction is made possible by ________. The number of channels utilized in saltatory conduction is less than continuous conduction due to which delay of nerve impulse does not occur. Because it varies in amplitude, the local potential is said to be graded. Conduction velocity is also affected by myelination of the nerve fibre. 2.) That part of the nervous system that is voluntary and conducts impulses from the CNS to the skeletal muscles is the ________ nervous system. They increase amplitude as they move away from the stimulus point. B) A single type of channel will open, permitting simultaneous flow of sodium and potassium. The interior is: lower The transmission of a nerve impulse from one neuron to another neuron is achieved by a synaptic connection (synapse) between them. 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. 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). A) erratic transmission of nerve impulses. C) Specific sodium gates will open. Thus, no sodium ions will move inside the membrane. True or False, The oligodendrocytes can myelinate several axons. First, the neurotransmitter molecules simply diffuse out of the narrow synaptic cleft. B) large nerve fibers Other neurotransmitters stimulate a net efflux of positive charge (usually in the form of K+ diffusing out of the cell), leaving the inside of the membrane more negative. This problem has been solved! This transmission of a nerve impulse across the neuron membrane as a result of a change in membrane potential is known as Nerve impulse conduction. c) short distance hyperpolarization Which of the following is not true of graded potentials? A nerve impulse is similar to a lightning strike. the interior is _____. These are nerve impulses that jump from one node to another and are seen only in myelinated nerve fibres. ________ law is the relationship between voltage, current, and resistance. 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. d) cells with gap junctions use chemical synapses, the synaptic cleft prevents an impulse from being transmitted directly from one neuron to another, Which of the following is true about the movement of ions across excitable living membranes? Due to this, a difference in electrical potential is generated across the membrane, known as nerve impulse or action potential. Collections of nerve cell bodies outside the central nervous system are called ________. farther and farther along the circuit. Signals are propagated along the nerve fibres in the form of nerve impulses. An excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle is ________. a) mechanically gated channel Which of the following is not a Which of the following is a good example of a neuromodulator? When one or more presynaptic neurons fire in rapid order it produces a much greater depolarization of the postsynaptic membrane than would result from a single EPSP; this event is called ________ summation. { "11.1:_Case_Study:__The_Control_Center_of_Your_Body" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.
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a second nerve impulse cannot be generated until