At the relative end of synaptic transmission, the vesicles (containing stored neurotransmitter) migrate and fuse with the pre-synaptic membrane. Which of the processes/steps below causesthis vesicle-migration and fusion? a. the calcium current at the axon-terminal b. the graded potential at the dendrites c. the peak of the action potential amplitude d. the potassium current that causes repolarization

At the relative end of synaptic transmission, the vesicles (containing stored neurotransmitter) migrate and fuse with the pre-synaptic membrane. Which of the processes/steps below causesthis vesicle-migration and fusion? a. the calcium current at the axon-terminal b. the graded potential at the dendrites c. the peak of the action potential amplitude d. the potassium current that causes repolarization

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

See similar textbooks

Similar questions

A channel opens on a postsynaptic membrane that causes a negative ion to leave the cell. What type of graded potential is this? a. depolarizing b. repolarizing c. hyperpolarizing d. non-polarizing
Which of the following statements relating to depolarization is incorrect? a. it is a reduction in membrane potential b. inside the membrane becomes less negative than resting potential c. enhances the probability of producing an action potential d. causes the voltage of internal membrane towards zero e. none of the above
Neurotransmitters: a. Can only inhibit the postsynaptic cell b. Can be part of a process that regulates transcription and translation in the postsynaptic cell с. Are bound to their receptors forever, until the receptor is degraded and recycled. d. Can exit the presynaptic cell without assistance. e. Can only excite the postsynaptic cell Clathrin: Is embedded in the cell membrane of the synaptic terminal. a. b. Degrades vesicles for recycling and return to the axon hillock с. Mediates ALL endocytosis in the body, including the formation of vesicles in the synapse. d. Forms a coat of octagonal proteins. e. Helps the vesicle leave the pre-synaptic cell, and fuse to the membrane of the post-synaptic cell
There is a type of toxin found in the liver of the puffer fish that prevents the opening of voltage-gated Na+ channels in neurons. The effect of this toxin is to: Group of answer choices A. prevents the initiation of the action potential B. depolarizes the membrane potential and maintains it depolarized C. prolongs the return of the membrane potential to the resting level D. increases the duration of the action potential
Which of the following neuronal changes is associated with short term synaptic strength? O a. Changes in the size of neural spines o b. Changes in the shape of neural spines с. Increased production of neurotransmitter vesicles in the presynaptic cell o d. Increased buildup of Ca²+ in the terminal knob of the presynaptic axon О е. Increased expression of postsynaptic neurotransmitter receptors
A synapse with all of these; a postsynaptic dendrite, an astrocyte end foot, and the presynaptic terminal button/bouton is called..... A. synaptic convergence B. engulfment synapse C. tripartite synapse D. receptor confluence synapse E. astrocytic engulfment
On the graph above, when do the sodium ion channels close? Select one: a. between 0.2 ms and 0.5 ms, which is when depolarization occurs b. at 0.2 ms, which is when depolarization occurs c. at 0.5 ms, which is when repolarization begins d. between 0.5 ms and 0.8 ms, which is when repolarization occurs
Excitatory postsynaptic (EPSP'S) the resting membrane potentials A. have little or no effect b Hyperpolarize c. do notchange d. depolarize
Use this illustration to place these events in the order they occur during synaptic communication: Column A Column B a. Voltage gated sodium channels carry the action potential to the synapse by allowing the influx of sodium ions. 1. 1 2 b. An increase in calcium levels triggers vesicle release. 3. 3 c. Sodium enters the post-synaptic cell, causing it to depolarize. 4. 4 d. Sodium influx at the synapse activates voltage gated 5. calcium channels which allow calcium ions to enter the presynaptic neuron. 6. 6. e. Neurotransmitters are released into the synaptic cleft. f. Ligand-gated ion channels are opened by the neurotransmitters. 2.
What are all the possible ways that a neurotransmitter is removed from the synaptic cleft? Select all that apply. A. Taken up by postsynaptic transporters B. Taken up by presynaptic transporters C. Broken down by enzymes in the cleft D. Broken down by enzymes in the presynaptic side E. Broken down by postsynaptic enzymes
What determines the effect of neurotransmitter release on the post-synaptic neurons? a. the size of the action potential. b. the post-synaptic receptors c. the neurotransmitter contained in the synaptic vesicles. d. the concentration of calcium ions reached in presynaptic terminals. e. the size of the synaptic vesicles.
List the membrane potential value that would coincide with the following events: a. Resting membrane potential b. Graded potentials c. Threshold for action potentials d. Opening of Potassium Channels/Closing of sodium channels during action potential.