Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
16 Cards in this Set
- Front
- Back
|
What are the 2 types of supporting cells for the PNS
|
Schwann and satellite
|
|
|
Whattype of cell supports the CNS
|
Glial cells
|
|
|
Dendrites conduct info toward or away from the cell body
|
Toward
|
|
|
Axons conduct info toward or away from the cell body
|
Away
|
|
|
Function of neuro supporting cells
|
protection, provide metabolic support to the neurons and aid in segregating them into compartments which is necessary for normal neuro function
|
|
|
Major fuel for nervous system
|
glucose
|
|
|
What does an impulse (action potential) represent
|
movement of an electrical charge along the axon membrane
|
|
|
During the resting phase of the action potential, is the inside of the cell more negatively or more positively charged
|
The inside of the cell is more negatively charged during the resting phase, making it polarized
|
|
|
What is the threshold potential
|
it represents the membrane potential at which neurons are stimulated to fire. The ion gates open at this time
|
|
|
What is depolarization
|
the flow of electrically charged ions
|
|
|
What does repolarization represent
|
The polarity of the resting membrane is re-established by the closure of the sodium channels
|
|
|
Absolute refractory period
|
The time in which a membrane is not allowed to fire during repolarization
|
|
|
Relative refractry period
|
Time in which a membrane can be stimulated, although it would need a stonger than normal stimulus (this is during repolarization)
|
|
|
Electrical synapses permit passage of current carrying ions through:
|
gap junctions
|
|
|
The gap junction allows for indirect or direct passage of action potential from one cell to the next
|
Direct
|
|
|
Do checmical synapses allow for one-way or two-way communication
|
two way
|
