Multiple Choice
An _____ is a chemical substance that mimics or enhances the effects of a neurotransmitter.
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3. Biological Psychology
Communication in the Nervous System
Multiple Choice
When neurons fire and transmit messages, they
A
begin slowly, then gradually increase in velocity.
B
begin rapidly, then gradually slow down.
C
do so in an all-or-none fashion.
D
sometimes transmit information partially, depending on signal strength.
Verified step by step guidance1
Understand the concept of 'all-or-none' principle in neural firing: Neurons either fire at full strength or not at all, similar to a light switch being either on or off.
Recognize that the 'all-or-none' principle means that once the threshold is reached, the neuron will fire completely, regardless of the strength of the stimulus beyond the threshold.
Consider the process of action potential: When a neuron fires, it generates an action potential that travels down the axon to communicate with other neurons.
Differentiate between the 'all-or-none' principle and other options: Neurons do not gradually increase or decrease in firing speed; they either fire or they don't.
Apply this understanding to the problem: The correct answer is that neurons fire in an all-or-none fashion, meaning they do not transmit information partially or vary in speed based on signal strength.
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