Following release of acetylcholine (ACh) from a synaptic terminal bouton, the ACh Question 2 options: a) diffuses across the synaptic cleft and binds to Cholinergic receptors b) is broken down by acetylcholinesterase on the surface of the postsynaptic cell c) is transported back into the axon terminal and repackaged into synaptic vesicles d) answers (a) and (b) are both correct; answer (c) is incorrect e) answers (a), (b) and (c) are all correct

Following release of acetylcholine (ACh) from a synaptic terminal bouton, the ACh Question 2 options: a) diffuses across the synaptic cleft and binds to Cholinergic receptors b) is broken down by acetylcholinesterase on the surface of the postsynaptic cell c) is transported back into the axon terminal and repackaged into synaptic vesicles d) answers (a) and (b) are both correct; answer (c) is incorrect e) answers (a), (b) and (c) are all correct

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter4: Principles Of Neural And Hormonal Communication

Section: Chapter Questions

Problem 4TAHL: Assume presynaptic excitatory neuron A terminates on a postsynaptic cell near the axon hillock and...

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Which of the following is the role of axonal Calcium (Ca2+) channels in neuronal communication at the synapse? a) they inhibit the action potential causing it to stop b) Calcium channels have no role in this process c) by allowing calcium to exit the cell, they promote the propagation of action potential across the synapse by creating depolarization d) by blocking calcium entrance, they mediate the contraction of presynaptic axon to facilitate movement e) when they open, calcium enters the presynaptic terminal, promoting fusion of neurotransmitter vesicles with presynaptic membrane, and release of neurotransmitters to the synaptic cleft
Which statement is true regarding the neuron synapse? B) binging of a neurotransmitter on the postsynaptic neuron membrane can generate an action potential in that neuron C) the binding of a neurotransmitter always causes an excitatory effect on that cell, never inhibitory D) the presynaptic and pastsynaptic neuron membranes are not physically separated
Calcium entry through NNDA receptor can potentiate synaptic transmission through the following mechanisms EXCEPT: a.) Insertion of AMPA receptors to postsynaptic membrane b.) Synthesis of NO to increase presynaptic transmitter release c.) Phosphorylation of AMPA receptors d.) Slowing down glutamate reupdate, so it remains longer in the synapse
Which of the following statements concerning synapses is FALSE? O A) Modulation of synaptic strength can be presynaptic of postsynaptic B) High frequency stimulation in the presynaptic neuron often leads to DECREASED neurotransmitter release O C) Modulation of synaptic strength can either be short term, lasting seconds, or long term, lasting as long as a lifetime. D) Agonists are drugs that mimic neurotransmitters and antagonists are drugs that block the action of neurotransmitters O E) Certain drugs prevent the reuptake of neurotransmitter from the synapse
Saltatory conduction is a term applied to the "jumping" movement of action potentials Multiple Choice a) along the postsynaptic membrane from dendrite to axon hillock. b) along myelinated axons. c) from one neuron to another. d) in two directions at the same time. e) across electrical synapses.
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.
How is the choice of neurochemical to be released at a synapse determined? A) We don't have enough information to draw conclusions about how this process occurs. B) The postsynaptic structure signals its "choice" to the presynaptic structure. C) The presynaptic structure begins to release its neurochemical onto postsynaptic structures, which adapt by producing the appropriate receptors. D) The "choice" is determined by the genes of both the pre- and postsynaptic cells.
Which statement is true regarding the neuron synapse? A) the preganglion and post ganglionic Neurons physically touch B) a neuronal synapse consists of dendrites on a peeganglionic neuron and the axon terminal is a postganglionic neuron C) binding of a neurotransmitter on a post ganglionic neuron always generates an action perennial D) neurotransmitters can be degraded by enzymes within the synaptic cleft to terminate its effect
please answer D through K
Action potential conduction velocity is higher in a myelinated axon compared to an unmyelinated axon because … Question 1 options: a) the diameter of a myelinated axon is greater than the diameter of an unmyelinated axon. b) a myelinated axon has more voltage-gated sodium channels than an unmyelinated axon. c) less axonal membrane is exposed to the ECF in a myelinated axon compared to an unmyelinated axon. d) answers (a) and (b) are both correct; answer (c) is incorrect e) answers (a), (b) and (c) are all correct
Which of the following is true regarding the difference between graded and action potentials? a.) Action potential occur only when the surface of the neuron is myelinated, but graded potentials occur in both in both myelinated and non-myelinated neurons. b.) The magnitude of action potential depends on the magnitude of the stimulus, whereas graded potentials are all or none. c.) The magnitude of graded potential depends on the magnitude of the stimulus, whereas action potentials are all or none.
You identify a new neuron in the fruit fly's brain and find it contains acetylcholine. 1) Based on this identification, this neuron is (a) Excitatory, (b) Inhibitory, (c) Neither excitatory nor inhibitory, or (d) Either excitatory or inhibitory 2) Briefly explain your answer above. 3) How would you figure out your answer above? Briefly describe an experiment you would do. Edit Format Table

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	a) diffuses across the synaptic cleft and binds to Cholinergic receptors
	b) is broken down by acetylcholinesterase on the surface of the postsynaptic cell
	c) is transported back into the axon terminal and repackaged into synaptic vesicles
	d) answers (a) and (b) are both correct; answer (c) is incorrect
	e) answers (a), (b) and (c) are all correct