Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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The place where a neuron and myocyte communicate is a call a _ junction
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- Place the following events in chronological order from 1-8: Nat enters the cell, and depolarization occurs to approximately +30 mV. The voltage across the cell membrane is -70 mV, the resting membrane potential. Upon reaching the peak of the action potential, the VG Nat channels are inactivated by the closing of their inactivation gate and the activation gate of each VG K channel opens. VG K channels close by the closing of their activation gate, and the resting membrane potential is gradually restored. An excitatory post-synaptic potential depolarizes the membrane to threshold and the activation gate of VG Nat channels open. Upon returning to the resting membrane potential, VG Na channels are reset by opening of the inactivation gate and the closing of the activation gate. VG K+ channels are slow to close, resulting in an excess of K* efflux and hyperpolarization. Depolarization occurs as K+ flows out of the cell.arrow_forwardIn terms of function when a presynaptic neuron receiving input from a nearby inhibitory neuron, it can be inferred that the both neurons firing won't be synchronized activation of the inhibitory neuron is nullified activation of the presynaptic neurotransmitter release is enhanced this type of interaction represents a regulatory input of neuronal activationarrow_forwardTrue/False - The action potential is always the same size, regardless of the strength of excitatory signaling that a neuron is receiving.arrow_forward
- Which statement is TRUE about the synapse? Neurotransmitters shuttle the signal back and forth between the pre- and post-synaptic cell. The pre-synaptic cell and post-synaptic cell are in direct contact, allowing the electrical signal to seamlessly flow from one to the other. The action potential jumps from the pre-synaptic cell into the post-synaptic cell. The action potential ends in the pre-synaptic cell and neurotransmitters carry the signal across the synaptic cleft to the post-synaptic cell.arrow_forwardWhich of the following would be used by a cell to signal cells close by? You can choose multiple answers paracrine hormonal synapse directarrow_forwardThe Purkinje cell is an example of this type of neuron. sensory neuron pyramidal neuron Oprincipal neuron Obipolar neuronarrow_forward
- Part A When sodium ion channels open, what happens to the cell's membrane potential? O hyperpolarization O repolarization depolarization the cell maintains its resting membrane potential Submit Request Answer Provide Feedbackarrow_forwardNeurons communicate with other cells at chemical synapses at the end of their _____ Neurotransmitters enter the synaptic cleft via -_____ and bind to receptors on the signal-receiving cell to trigger the flow of ions.arrow_forwardTrue or False: Calcium pumps in the axon terminal exchange molecules of calcium with molecules of potassium from the extracellular fluidarrow_forward
- The neuron cell is made up of which of the following parts? Axon Dendrite Soma All of the abovearrow_forwardWhich type and speed of slow axonal transport moves distinct polypeptides to the neuronal periphery? SCa 0.1 to 1mm/day SCa 1 to 3mm/day SCb 1 to 3mm/day SCc 0.1 to 100mm/dayarrow_forwardA signal generated via a neurotransmitter in the synaptic cleft is considered an autocrine signal True Falsearrow_forward
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