Anybody's Guess
True of false
A multipolar neuron has many axons.
False all neurons have one axon
Excitability
Ability to undergo an action potential in response to a stimulus
Do CNS axons regenerate when severed?
Purpose of ciliated ependymal cell
move cerebrospinal fluid
Cranial nerves
Nerves of PNS that originate from the brain
Depolarization causes what changes on K+
no change at all, some may leak out due to permeability of membrane
Efferent neurons
Neurons that transmit action potentials from CNS to the effector organs
Potential difference
a measure of the charge difference across the cell membrane
Deolarization in an axon causes what changes on Na+
Na+ diffuses into the cell
Afferent neurons
Neurons that transmit action potentials from sensory receptors to the CNS
Somatic motor nervous system
Neurons that transmit action potentials from the CNS to the skeletal muscles
Spinal nerves
PNS nerves that originate from the spinal cord
Name two of the three conditions needed for an axon to regenerate when severed
1) cell body must be alive
2) axon must be covered in Schwann cells
3) axon must be reasonably aligned with severed end
In an excitatory synapse, compare the frequency of the action potentials in the presynaptic neuron to the postsynaptic neuron
Presynaptic will have higher frequency than postsynaptic
Listening to radio. Mom turns it up. Compare frequency of action potentials from ears to CNS before and after turned up.
After turned up frequency of action potentials increases
Neuron sends signal and it sends it back to itself. What kind of neuron arrangement is this?
Oscillating circuit
Ganglia
Collections of neuron cell bodies that are outside of the CNS
At a synapse, neurotransmitters cause K+ channels to open on the postsynaptic membrane. What type of synapse is this?
Inhibitory synapse
Type of conduction when action potential skips from node f Ranvier to node of Ranvier
Saltatory conduction
Sympathetic Division
Division of neurons of the ANS that prepare the body for increased energy expenditure
stimulus on neuron does not result in an action potential. Why?
subthreshold or axon in absolute refractory period
Association neuron
A neuron that conducts neural signals from one neuron to another neuron within the CNS
Nerves
Bundles of axons and their sheaths that extend out from the CNS
Autonomic Nervous system
PNS neurons that transmit action potentials from the CNS to smooth muscles, cardiac muscles, and glands
Parasympathetic division
Division of neurons of the ANS that stimulate resting and nutrition-related functions such as digestion, defecation, and urination