18. How is a nerve impulse transmitted across a synapse from a presynaptic to a postsynaptic cell? a. via a direct connection b. via a electrical spark c. via a neurotransmitter d. via Na+ ions e. Both a and b are correct answers

18. How is a nerve impulse transmitted across a synapse from a presynaptic to a postsynaptic cell? a. via a direct connection b. via a electrical spark c. via a neurotransmitter d. via Na+ ions e. Both a and b are correct answers

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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Question

18. How is a nerve impulse transmitted across a synapse from a presynaptic to a postsynaptic cell?

a. via a direct connection

b. via a electrical spark

c. via a neurotransmitter

d. via Na⁺ ions

e. Both a and b are correct answers

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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.
1. A site of communication between neurons is called a _________ 2. Where is the cerebral spinal fluid found? a.Between the dura mater and the arachnoid mater b.Between the dura mater and the pia mater c.Between the arachnoid mater and the brain d.Between the pia mater and the brain 3. The neuron processes that normally receives incoming stimuli are called _____?
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.
Where are neurotransmitter receptors located?(A) the nuclear membrane(B) the nodes of Ranvier(C) the postsynaptic membrane(D) synaptic vesicle membranes
1) Voltage-gated ion channels on the cell body: a) allow Ca2+ to enter, leading to neurotransmitter release. b)have binding sites for neurotransmitters. c)open following entry of Na+ through ligand-gated channels. d) are inactivated by enzymes in the synaptic cleft.
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
1. Neurotransmitters are chemical substances that carry information across the synaptic gap to the next neuron in form of ? 2. The cell body of peripheral sensory neurons is located within the: a.brain b.dorsal gray horn c.spinal cord d.dorsal root ganglion
What do multiple sclerosis and ALS (amyotropic lateral sclerosis) have in common?a. They both are more common in young men than in young women.b. They both impair the initiation of action potentials.c. They both damage the myelin sheath, disrupting action potential transmission.d. They both impair nerve function in the peripheral nervous system
The integrative functions of the nervous system are performed mainly bya. afferent neurons.b. efferent neurons.c. neuroglia.d. sensory neurons.e. interneurons.
Ganglia are ... a) ... collections of nerve cell bodies outside the CNS b) ... part of a nerve cell c) ... the connection between two nerve cells d) ... collections of nerve fibers in the CNS e) ... a type of glial cells in the brain
5. The falling phase of the action potential due to the: A. Entry of sodium ions B. Exiting of sodium ions C. Entry of potassium ions D. Exiting of potassium ions
Transmission of the nerve impulse across a synapse isaccomplished bya. the release of Na+ at the presynaptic membrane.b. the release of neurotransmitters at the postsynaptic membrane.c. the reception of neurotransmitters at the postsynapticmembrane.d. Both a and c are correct.