Exam 2 Flashcards
Resting state of Na+ channel:
Activation gate closed, Inactivation gate open
Activated state of Na+ channel:
Both gates are open
Inactive state of Na+ channel:
Activation gate open, Inactivation gate closed
Deactivated state of Na+ channel:
Both gates closed
Speed of Na+ channels:
fast
Speed of K+ channels:
slow
As Na+ channels start to become inactive, K+ channels..
..start opening to speed up repolarization.
The equilibrium potential for Ca++ is..
..really positive.
2 factors that influence how fast an action potential travels down cell:
size (smaller=slower)
Insulation
Myelin producing cells in CNS:
Oligodendrocyte
Myelin producing cells in PNS:
Schwann cell
Which myelin producing cell is more likely to lay down new myelin when old myelin is damaged?
Schwann
Node of Ranvier
Space between myelin where neuron is exposed
Saltatory Conduction
Na+ jumps from one node of ranvier to the next NofR.
Examples of demyelinating diseases:
Multiple sclerosis (MS), Optic Neuritis, Guillain-Barre syndrome
Causes of demyelinating diseases:
genetics, infection, autoimmune hyperactivity, polyneuropathies
CNS: Central nervous system
Brain and spinal cord
PNS: Peripheral nervous system
Place where our spinal nerves begin
ANS: Autonomic nervous system
Automated system that we aren’t aware of
Somatic
something we are aware of, opposite of ANS
A-fibers:
myelinated neuron
largest
fastest
-3 subsets