- Studocu Neurons and their thresholds, axons, dendrites, and Na+/K+ ATPases. A) Voltage would be measured by placing one electrode inside the membrane and another outside the membrane. A neuron that has as its primary function the job of connecting other neurons is called a(n) _____. This series of activations, by propagating the action potential along the fibre with virtually no reduction in amplitude, gives the nerve impulse its regenerative property. Not ready to purchase the revision kit yet? The flow of which type of ion into the neuron results in an action potential? Unipolar neurons have axons structurally divided into peripheral and 50. In what way does the interior surface of a cell membrane of a resting Vesicle membranes are then recovered from the plasma membrane through endocytosis. Calcium causes synaptic vesicles to fuse with the membrane, releasing their contents into the narrow space between the presynaptic and postsynaptic membranes. In myelinated neurons, ion flows occur only at the nodes of Ranvier. 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. 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) neurolemma (Do not expand to minterm form before plotting.) Which of the following is correct relative to Ohm's law? 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. These electrochemical changes cause depolarization of the membrane resulting in the generation of nerve impulses. Repolarization Neurons are a complex network of fibers that transmit information from the axon ending of one neuron to the dendrite of another neuron. 2.) Strong stimuli cause the amplitude of action potentials generated to increase. A neural circuit in which a single impulse is transmitted over and over is a ________. c) voltage-gated channel 1.) A second nerve impulse cannot The They may also be removed from the terminal by exchange with extracellular Na+a mechanism known to occur at some neuronal membranes. In electrical transmission, the ionic current flows directly through channels that couple the cells. Figure \(\PageIndex{4}\)shows the change in potential of the axon membrane during an action potential. B) Sodium gates will open first, then close as potassium gates open. interior is ________. 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. if the ventral nerve root of a spinal is never destroyed a person would lose.. . B) destroy ACh a brief period after its release by the axon endings. negatively charged and contains less sodium. Nerve impulse propagates by jumping from one node of Ranvier to the next. Plasma membrane exhibits voltage-gated Na+ and K+ channels. What is the role of acetylcholinesterase? One mechanism, the sodium-potassium pump, maintains the resting potential, and another, the various ion channels, helps create the action potential. D) Some ions are prevented from moving down their concentration gradients by ATP-driven pumps. a sample of Au-198 with a half-life of 2.7 days after 5.4 days. It means it doesnt conduct nerve impulses in this state. The EPP is actually made up of multiple MEPPs, which arise when an activated terminal releases hundreds of neurotransmitter quanta. Axon diameter and degree of myelination determine nerve impulse after-discharge circuitD) Converging circuit, Cell bodies of sensory neurons may be located in ganglia lying The inside of the membrane becomes negative again. ________ potentials are short-lived, local changes in membrane potential that can be either depolarized or hyperpolarized. insufficient stimulus. A second nerve impulse cannot be generated until The membrane potential has been reestablished In what way does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environment? 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. The sympathetic and parasympathetic are subdivisions of the ________. True or False, The two major classes of graded potentials are transmitter potentials and receptor potentials. 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. B) Absolute refractory period. An cord and sensory ganglia of cranial nerves? Which of the choices below describes the ANS? He pushes off the boards with a force of 9.0 N. 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