Flashcards in Q6 (Go over again) Deck (10):
Why is the diameter of the squid's giant axon so large?
Because it is unmyelinated, so this is to decrease the resistance and allow for greater longitudinal current.
In mammals what increases axonal speed of propagation without increasing fiber diameter?
What type of currents flow from an advancing action potential and depolarize the membrane ahead to allow propagation?
As axon diameter decreased, is more or less current necessary to stimulate it?
What is the classic preparation for myelinated axons in vertebrates?
Frog sciatic nerve
The myelinated regions of axons are called what?
The unmyelinated regions of axons are called what?
Nodes of Ranvier
Ion channel densities are tenfold greater in what axonal regions?
The nodes between myelin regions
What pathological condition causes axons to become demyelinated in a patchy and unpredictable way?