Nervous System Dixson
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- 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.