Nervous Tissue II_Test
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Which type of channel is responsible for establishing the resting membrane potential? | Passive channels
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Which type of channel is responsible for establishing synaptic potentials? | Chemically gated channels
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An excitatory postsynaptic potential (EPSP) is produced when the movement of ions makes the inside of the cell more __________. | positive
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Ion channels on a typical excitatory synapse are specific for __________. | cations, such as sodium and potassium
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An inhibitory postsynaptic potential (IPSP) makes the inside of the cell more | negative
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Ion channels in a typical inhibitory synapse are specific for which of the following ions? | Chloride
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An example of a neurotransmitter that works indirectly, by using a second messenger instead of opening ion channels, is: | GABA.
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Which of the following neurotransmitters only act indirectly? | Norepinephrine (NE)
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Which of the following neurotransmitters can act both directly and indirectly? | Acetylcholine (ACh)
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When a neurotransmitter acts indirectly, it activates a G protein, which then activates an enzyme that produces a second messenger. What does the second messenger activate? | An intracellular enzyme
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Which of the following parts of the neuron contains the nucleus and most of the cytoplasm aand organelles | cell body
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A neurotransmitter shich prevents sodium channels from opening in the receiving (postsynaptic) neuron would be considered | inhibitory
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Which of the following is a true statement about neurotransmitters | Neurons can release more than one kind of neurotransmitter; calcium is required in order for neurotransmitters to be released; it can be either excitary or inhibitory, depending on the effector that receives it
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Which of the following would transmit an action potentional at the greatest speed | thick myelinated fiber
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A neuron which causes the contraction of a muscle or the secretion of a gland is called | a motor neuron
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An afferent neuron carries an action potentional | from a sensory neuron toward the central nervous system
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Neurons release neurotransmitters into the | synaptic cleft or synapse
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