a second nerve impulse cannot be generated until

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Beginning at the resting potential of a neuron (for instance, 75 mV), a local potential can be of any grade up to the threshold potential (for instance, 58 mV). a sample of Au-198 with a half-life of 2.7 days after 5.4 days. A single type of channel will open, permitting simultaneous flow of are crucial for the development of neural connections. During polarization, the membrane is in a resting potential state. ________. B) the impulse would spread bidirectionally. Which of the following correctly describes a graded potential? These electrochemical changes cause depolarization of the membrane resulting in the generation of nerve impulses. 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. Which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of action potentials? One incoming fiber triggers responses in ever-increasing numbers The most common potential change is depolarization, caused by a net influx of cations (usually Na+). then require a negative potential to reset. Dendrites- Receive the signals from the axon ends. Strong stimuli cause the amplitude of action potentials generated to increase. Which of the following is not characteristic of neurons? Continuous conduction requires more energy to transmit impulses and is a slower process (approximately 0.1 m/s). B) negatively charged and contains less sodium. Temperature directly correlates with the transmission of nerve impulses. This combined action of EPPs is called summation. Also called a nerve impulse transmitted by ions Action Potential During this; an exceptionally strong stimulus can trigger a response Relative Refractory Period Numerous nerve impulses arriving at a synapse at closely time intervals exert a cumulative effect during this period Temporal Summation This area is called the synaptic cleft. Schwann cells are functionally similar to ________. Due to the high concentration of sodium ions inside the axoplasm, the potassium channels will open. Calcium ions. Name any four of them.. 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. This threshold potential varies but is generally about 15 millivolts (mV) more positive than the cell's resting membrane potential. the membrane potential has been reestablished. 4.) In myelinated neurons, ion flows occur only at the nodes of Ranvier. Which of the following is false or incorrect? a) an inhibitory postsynaptic potential occurs if the inhibitory effect is greater than the excitatory, causing hyperpolarization of the membrane A second nerve impulse cannot be generated until ________. A nerve impulse, like a lightning strike, is an electrical phenomenon. In an action potential, the cell membrane potential changes quickly from negative to positive as sodium ions flow into the cell through ion channels, while potassium ions flow out of the cell, as shown in Figure \(\PageIndex{3}\). When the action potential is over (after transmitting the nerve impulse through neuron) the cell membrane potential returns back by repolarizing the membrane. The action potential will move down the axon toward the synapse like a wave would move along the surface of the water. 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). Not ready to purchase the revision kit yet? It can be generated when a neurons membrane potential is changed by chemical signals from a nearby cell. A third process, called mobilization of the transmitter, is traditionally postulated as taking up the remaining time, but evidence suggests that the time is occupied at least partially by the opening of calcium channels to allow the entry of Ca2+ into the presynaptic terminal. Which of the following describes the nervous system integrative function? A neuron that has as its primary function the job of connecting other neurons is called a(n) ________. D) Some ions are prevented from moving down their concentration gradients by ATP-driven pumps. True or False, Reflexes are rapid, automatic responses to stimuli. Nerve impulse propagates by jumping from one node of Ranvier to the next. analyzes sensory information, stores information, makes decisions. Schwann cells are functionally similar to ________. d) act as a transmitting agent, destroy ACh a brief period after its release by the axon endings, Which of the following is false or incorrect? The part of a neuron that conducts impulses away from its cell body is called a(n) ________. 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). The interior is Negatively charged and contains less sodium Nerve Impulse is a major mode of signal transmission for the Nervous system. Saltatory is faster than continuous conduction and occurs in myelinated neurons. will result in no response in a neuron. In electrical transmission, the ionic current flows directly through channels that couple the cells. Determine its coordinate direction angles of the force. The term central nervous system refers to the ________. Which of the following is not a function of the autonomic nervous system? 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? What are ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid called? D) pumps three sodium ions outside the cell and two potassium ions inside. The neuron is responsible for transferring signals to three target cells: And this results in the contraction of muscle, secretion by glands and helps neurons to transmit action potential. The chemically gated channel, NMDA, allows ________ ions entry into the nerve cell. In what way does the interior surface of a cell membrane of a resting (nonconducting) . That part of the nervous system that is voluntary and conducts impulses from the CNS to the skeletal muscles is the ________ nervous system. 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. 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The interior is: lower Select the correct statement regarding synapses. 50. C) help to circulate the cerebrospinal fluid. In contrast to electrical transmission, which takes place with almost no delay, chemical transmission exhibits synaptic delay. Which of the following is not a special characteristic of neurons? In electrical synapses, the synaptic gap is about 0.2nm which also favors faster nerve impulse conduction. It is a condition during which the electrical balance is restored inside and outside the axon membrane. 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.

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a second nerve impulse cannot be generated until