BIOLOGICAL BASES OF BEHAVIOR
NEUROTRANSMISSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Excitation decreases the likelihood that a neuron will fire
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Inhibition decreases the negative charge of the postsynaptic neuron
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Excitation increases the likelihood that a neuron will fire
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Inhibition increases the likelihood that a neuron will fire
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Detailed explanation-1: -Suggested Answer: Excitation occurs when receptor stimulation results in an increase in the positive charge of the postsynaptic neuron which increases the likelihood of the neuron firing.
Detailed explanation-2: -Excitatory neurotransmitters have excitatory effects on the neuron. This means they increase the likelihood that the neuron will fire an action potential.
Detailed explanation-3: -Na+ enters the postsynaptic cell and causes the postsynaptic membrane to depolarize. This depolarization is called an excitatory postsynaptic potential (EPSP) and makes the postsynaptic neuron more likely to fire an action potential.
Detailed explanation-4: -An excitatory message increases the likelihood that the postsynaptic neuron will activate and generate an action potential. Conversely, an inhibitory message decreases the likelihood that the postsynaptic neuron will activate.
Detailed explanation-5: -What current causes depolarization, increasing the likelihood that the neuron will fire? A transient all-or-nothing electrical current that is conducted down the axon when the membrane potential reaches the threshold of excitation.