Chapter 9 Flashcards
(20 cards)
At a synapse, the neuron that is sending the action potential is…
Presynaptic
Parts of a neuron
Cell body, dendrites, and axon
Astrocytes provide a protection of the brain called…
Blood-drain barrier
This lines the cavities of the brain in the CNS
Ependymal celis
Produces the myelin in the CNS
Oligodendrocyte
Supports the neurons in the ganglia
Satellite cells
Star shaped and supports neurons in the CNS
Astrocytes
Smallest in size of the neuroglia
Microglia
Forms neurolemma and myelin in PNS
Schwann cells
3 functions of the nervous system
Sensory, integrative, and motor
The synaptic cleft is the space that a ________________ crosses to initiate a response in a post synaptic neuron
neurotransmitter
What is the difference between a nerve and a tract
Nerve- in PNS
Tract - in CNS
Both bundles of myelinated fibers
The insulating material of a neuron in the PNS is…
Myelin
2 characteristics that would increase the speed of nerve transmission
Warmer temperature, larger diameter
The body’s natural painkiller is…
Endorphins
A neurotransmitter that helps regulate moods is…
Serotonin
The “fight or flight” nervous system is…
Sympathetic
Highly branched; input part of the neuron ________
Dendrite
Unmyelinated gap in the myelin sheath ______________
Note of Ranvter
Bundle of many axons in the CNS
Tract
