18 Questions
What is the most abundant glial cell in the brain?
Astrocytes
Which of the following is not a function of a Satellite glial cell?
Conduction of nervous impulses along axons
Which of the following is not characteristic of white matter?
Made up of neuronal cell bodies
Which of the following ions does not play a role in creating the transmembrane potential?
Oxygen
In the resting state of the cell, which ion is found at a concentration of 145 mM in the extracellular fluid?
Sodium
How is the resting membrane potential of a cell maintained?
The Sodium-Potassium pump actively transports 3 sodium ions out of the cell for every 2 potassium ions brought into the cell
What causes depolarization of a neuron?
Sodium gates open, allowing sodium to flood into the cell and make the membrane potential less negative
What is the definition of an action potential?
The rapid rise and drop in membrane potential that occurs when a neuron fires
What is the definition of a synapse?
Specialized junctions through which neurons can signal to each other and other cells via neurotransmitter molecules.
What is temporal summation of synaptic potentials?
When successive EPSPs at a single synapse occur in rapid succession. The successive potentials occur before the previous ones die out producing an increasing membrane depolarization
Which of the following is not a class of neurotransmitter?
Nucleotides
The ion that enters a presynaptic axon terminal and that directly causes the release of a neurotransmitter substance from the presynaptic terminal is:
Calcium
Any change in a neuron's membrane potential that moves the membrane potential to a value more negative than the resting potential (e.g. -120mv) is:
Hyperpolarization
Which of the following is not a function of the autonomic nervous system?
Movement
The secretions of the adrenal medulla act to supplement the effects of:
sympathetic stimulation
The dryness of the mouth (cotton mouth) that occurs when some people are called upon to give an extemporaneous speech is the result of a:
sympathetic inhibition of the salivary glands
Regarding the functions of the autonomic nervous system, an individual at rest, digesting a large meal, would be primarily under the influence of the:
parasympathetic system
Postganglionic fibers of the parasympathetic division of the ANS release:
acetylcholine
Test your knowledge of neuroscience with this quiz covering topics such as the most abundant glial cell in the brain, functions of satellite glial cells, characteristics of white matter, and ions involved in creating transmembrane potential. Explore concepts related to the resting state of the cell and the maintenance of resting membrane potential.
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