This site is using cookies under cookie policy . 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) ________. May be involved in complex, exacting types of mental processing. Free Flashcards about ap chap 11 - StudyStack An action potential can form at these gaps and impulse will jump from node to node by saltatory conduction. True or False, In myelinated axons the voltage-regulated sodium channels are concentrated at the nodes of Ranvier. A) The release of neurotransmitter molecules gives cells the A nerve impulse is thus an important signal transduction mode for triggering a response in major body parts due to a strong stimulus. C) Specific sodium gates will open. What is the role of acetylcholinesterase? Which of the following will occur when an excitatory postsynaptic directly from one neuron to another. sodium and potassium. Numerous nerve impulses arriving at a synapse at closely timed nerve receptor to the brain. mimicked by morphine, heroin, and methadone?A) acetylcholine B) are found only on myelinated, peripheral neuron processes. A) Conducting regionB) Receptive regionC) Secretory It is a condition during which the electrical balance is restored inside and outside the axon membrane. What is the role of acetylcholinesterase? 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. This area is called the synaptic cleft. 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. analyzes sensory information, stores information, makes decisions. Polarization is the situation in which the membrane is electrically charged but non-conductive. Advertisement Advertisement b) Schwann cells This transmission of the nerve impulse by synapses involves the interaction between the axon ending of one neuron (Presynaptic neuron) to the dendrite of another neuron (Postsynaptic neuron). Subthreshold Stimulus An insufficient stimulus Spatial Summation the membrane potential has been reestablished. Which of the following would be the most typical urinary output in a day? What does this flow of ions do to the relative charge inside the neuron compared to the outside. Neuroglia that control the chemical environment around neurons by The number of channels utilized in saltatory conduction is less than continuous conduction due to which delay of nerve impulse does not occur. Hence, more time is taken in generating and then transmitting nerve impulses during an action potential. 5.) (Do not expand to minterm form before plotting.) This phenomenon has formed the basis for classifying mammalian nerve fibres into groups in order of decreasing diameter and decreasing conduction velocity. C) found in ganglia Which of these ions is actively transported through the cell membrane to establish a resting potential? 3.) This reverse polarity constitutes the nerve impulse. A second nerve impulse cannot be generated until ________. It is thus a mode of communication between different cells. a second nerve impulse cannot be generated until: the membrane potential has been re-established: in what way does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external enviroment? True or False, Saltatory conduction occurs because of the presence of salt (NaCl) around the neuron. True or False, Myelination of the nerve fibers in the central nervous system is the job of the oligodendrocyte. The fastest conduction velocity occurs in the largest diameter nerve fibres. Identify three general types of effects neurotransmitters may have on postsynaptic cells. It delays the process of conducting signals because it uses a higher number of ion channels to alter the resting state of the neuron. Generally, the speed of nerve impulse is 0.1-100 m/s. The change in membrane potential results in the cell becoming depolarized. Which of the following is not a special characteristic of neurons? Nerve impulse conduction is a major process occurring in the body responsible for organized functions of the body. b) an excitatory postsynaptic potential occurs if the excitatory effect is greater than the inhibitory effect but less than threshold Select the correct statement regarding synapses. b) postsynaptic potential 4.) Potassium ion channels then open, allowing potassium ions to flow out of the cell, which ends the action potential. Study now. Between these myelinated sheaths, unmyelinated gaps are presently known as the nodes of Ranvier. Which neuron would be found in the retina of the eye? B) A single type of channel will open, permitting simultaneous flow of sodium and potassium. Vesicle membranes are then recovered from the plasma membrane through endocytosis. A second nerve impulse cannot Another factor is the temperature of the nerve fibre. conduction to take place. 16. Nerve impulse propagates by jumping from one node of Ranvier to the next. Nerve impulse propagates by jumping from one node of Ranvier to the next. d) efferent neuron, What are ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid called? As instantaneous as the opening of sodium channels at threshold potential is their closing at the peak of action potential. Which neuron is common only in dorsal root ganglia of the spinal Explain how and why an action potential occurs. Which of the following is not a function of astrocytes? A nerve impulse is similar to a lightning strike. Which of the following is not a chemical class of neurotransmitters? The interior is ________. Join over 22,000 learners who have passed their exams thanks to us! For every two potassium ions that move inside the cell, three sodium ions are transported outside. the membrane potential has been reestablished. In the polarized state, the axon membrane is more permeable to potassium ions instead of sodium ions and as a result, it causes rapid diffusion of potassium ions. An action potential, also called a nerve impulse, is an electrical charge that travels along the membrane of a neuron. summationD) Threshold stimulus, The nodes of Ranvier are found only on myelinated, peripheral neuron processes. Choose the statement that is most correct about membrane potential. A nerve impulse is a wave of electrochemical changes that travel across the plasma membrane and helps in the generation of an action potential. 2.) c) sensory neurons that convey information from somatic receptors in the head, body wall, and limbs and from receptors from the special senses of vision, hearing, taste, and smell to the CNS Neuralgia that control the chemical environment around neurons by buffering potassium and recapturing neurotransmitters are. Therefore, repolarization helps in maintaining or restoring the original membrane potential state. True or False, During depolarization, the inside of the neuron's membrane becomes less negative. a single depolarization. This is called repolarization of the membrane. Plasma membrane exhibits voltage-gated Na+ and K+ channels. serotonin C) nitric oxide D) endorphin, A neuron that has as its primary function the job of connecting other 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. { "11.1:_Case_Study:__The_Control_Center_of_Your_Body" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.2:_Introduction_to_the_Nervous_System" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.3:_Neurons" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.4:_Nerve_Impulses" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.5:_Central_Nervous_System" : "property get [Map 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The action potential is +40 mV. 0.50.50.5 liters A) lowering the threshold for an action potential to occur. 2.) b) neurotransmitter receptors are located on the axons terminals of cells After many generations of random mating, the population goes through one cycle of self-fertilization. This change is called the postsynaptic potential, or PSP. The most common potential change is depolarization, caused by a net influx of cations (usually Na+). Saltatory is faster than continuous conduction and occurs in myelinated neurons. The first factor is the outside diameter of the nerve fibre. Which of the following is not a function of the autonomic nervous system? True or False, If bacteria invaded the CNS tissue, microglia would migrate to the area to engulf and destroy them. B) Neurotransmitter receptors are located on the axons terminals of cells. response observed in the left graph? A) erratic transmission of nerve impulses. A neural circuit in which a single impulse is transmitted over and over is a ________. 50. and participates in the generation and conduction of action voltage-gated channel 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 ________. the membrane potential has been reestablished. Thus, no sodium ions will move inside the membrane. In electrical transmission, the ionic current flows directly through channels that couple the cells. Which of the following is true about the movement of ions across excitable living membranes? c) ependymal cells A second nerve impulse cannot be generated until - BRAINLY The role of acetylcholinesterase is to ________. Na+ channels open: . All of the following are true of graded potentials except that they ________. b) opens K+ or Cl- channels In electrical synapses, the synaptic gap is about 0.2nm which also favors faster nerve impulse conduction. (nonconducting) neuron differ from the external environment? negatively charged and contains less sodium. Due to nerve impulse, the resting potential is changed to an action potential to conduct signals to the target in response to a stimulus. Which of the following is correct relative to Ohm's law? 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). After repolarization there is a period during which a second action potential cannot be initiated, no matter how large a stimulus current is applied to the neuron.
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