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10 Cards in this Set

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  • Back
What is the charge inside a resting neuron?
-70 mV
What are the three types of neurons?
sensory neurons, interneurons, and motor neurons
What are the two types of transmitter chemicals?
excitatory and inhibitory
Define Summation.
The sum effect of all neurotransmitters acting on a neuron.
What is the state of a neuron when an inhibitory chemical causes K+ to leak out of a cell?
hyperpolarized
Describe the all-or-none-response.
A nerve or muscle fibre responds completely or not at all to a stimulus.
Which is the difference between presynaptic neurons and postsynaptic neurons?
Presynaptic neurons are before the synaptic cleft, postsynaptic neurons are after it.
Define refractory period.
The recovery timer required before a neuron can produce another action potential.
What is included in the central nervous system?
The brain and spinal cord.
What is the function of nodes of Ranvier?
They speed up transmission of an impulse.