Set 17 Physiology Flashcards
What causes depolarization?
an influx of sodium
What causes repolarization?
efflux of potasium
When is the resting state?
before AP begins
What is the membrane potential during the resting state?
-90mV
When is the depolarization stage?
Na+ makes inside more positive
What is the membrane potential during the depolarization state?
0mV
What is the outside gate of the sodium channel called?
activation gate
What is the inside gate of the sodium channel called?
inactivation gate
Which gate of the sodium channel closes more slowly?
inactivation gate
When does the inactivation gate reopen?
when membrane potential is at or nearly at resting membrane potential
What does a presynaptic neuron do?
send the signal
What does a post synaptic neuron do?
receive the signal
What are most synapses?
axodendritic, from axon to dendrite
Where are gap junctions common?
visceral, smooth, and cardiac muscles
What is synaptic delay?
.5 m/sec