Which is NOT a criterion in order to be classified as a neurotransmitter? O It is synthesized in the presynaptic cell. O It is released by the presynaptic axon terminal upon stimulation. O It mimics the endogenous neurotransmitter when applied experimentally. O It is stored in the postsynaptic cell. O All the options are correct

Which is NOT a criterion in order to be classified as a neurotransmitter? O It is synthesized in the presynaptic cell. O It is released by the presynaptic axon terminal upon stimulation. O It mimics the endogenous neurotransmitter when applied experimentally. O It is stored in the postsynaptic cell. O All the options are correct

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter39: Information Flow And The Neuron

Section: Chapter Questions

Problem 8TYK: Which of the following statements best describes saltatory conduction? a. It inhibits direct...

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Which of the following statements best describes saltatory conduction? a. It inhibits direct neurotransmitter release. b. It transmits the action potential at the nodes of Ranvier andthus speeds up impulses on myelinated axons. c. It increases neurotransmitter release at the presynapticmembrane. d. It decreases neurotransmitter uptake at chemically gatedpostsynaptic channels. e. It removes neurotransmitters from the synaptic cleft.
A neuron releases an excitatory neurotransmitter. Some neurons are stimulated and some are not. How is it possible that the same signal activates one neuron and not the other?
When a postsynaptic neuron is adequately stimulated, action potentials develop at the initial segment of the axon because :-a- it contains many voltage-gated Na + channelsb- it contains the highest concentration of ligand-gated cation channelsc- it contains many voltage-gated Ca ++ channelsd- it is more sensitive to the direct stimulant effect of neurotransmitters
Synaptic fatigue is due to : -a- decreased synthesis of neurotransmittersb- inability to release neurotransmitters by exocytosisc- failure of action potentials to open voltage-gated Ca ++ channels in presynaptic terminald- imbalance in between rates of synthesis and release of neurotransmitters
Transmission of the nerve signal across a synapse is accomplishedby thea. movement of Na+ and K+.b. release of a neurotransmitter by a dendrite.c. release of a neurotransmitter by an axon.d. release of a neurotransmitter by a cell body.e. All of these are correct.
How do neurotransmitters directly affect the postsynaptic neuron? A)They cause a change in the electrical potential, exciting the neuron and causing it to fire b)They cause a change in the electrical potential, either exciting or inhibiting the next neuron. C)They cause a change in the electrical potential, inhibiting the neuron and stopping it from fi d)They connect with the appropriate receptor on the postsynaptic neuron
Which of the following is the most direct result of depolarizingthe presynaptic membrane of an axon terminal?(A) Voltage-gated calcium channels in the membrane open.(B) Synaptic vesicles fuse with the membrane.(C) Ligand-gated channels open, allowing neurotransmittersto enter the synaptic cleft.(D) An EPSP or IPSP is generated in the postsynaptic cell.
When EPSP and IPSP occur simultaneously the postsynaptic membrane :-a- becomes depolarizedb- becomes hyperpolarizedc- initiates an action potentiald- shows potential changes that depend upon the summation of their effects
A drug is called an agonist if it ________.a. blocks a receptorb. interferes with neurotransmitter reuptakec. acts like the endogenous neurotransmitter bybinding to its receptord. blocks the voltage-gated calcium ion channel
I have stimulated a neuron with dopamine for a second followed by treating it with cocaine and calcium chelating agent (which chelates out all calcium from the system making them unavailable for function), what will be the effect of such impulse on generating an action potential in the post-synaptic neuron? Will it be different if I pretreat the set of nerve cells with cocaine and calcium chelating agent followed by stimulating the neuron with dopamine? Justify your answer with proper reasoning in brief.
Gaba spillover from the inhibitory synapses can activate heteroreceptors and block presynaptic calcium channels in the excitatory axonal terminals TRUE OR FALSE Don't copy from Google
Which of the following is NOT an example of communication that happens from one neuron to another neuron? A. Endocrine signaling (ex. hormones secreted into the blood stream travel and bind to receptors on dstant cells). B. Retrograde neurotransmission (ex.the dendrite releases a neuroactive substance that binds to receptors on the axon terminal of a presynaptic neuron). C. Electrical communication via propagation of action potential from one node of ranvier to the next node of ranvier. D. Volume transmission (ex. neuropeptides diffuse away from the synapse and bind to receptors on adjacent cells) E. Electrical communication through gap junctions.