15.3 Passage Of An Action Potential Flashcards
1
Q
What happens to the size of the action potential from one end of the axon to the other?
A
Stays the same
2
Q
Depolarisation definition
A
Temporary reversal of charges on the cell- surface membrane of a neurone that takes place when a nerve impulse is transmitted
3
Q
Repolarisation definition
A
Return to the resting potential in the axon of a neurone after an action potential
4
Q
Passage of an impulse along the axon of an unmyelinated neurone
A
whole membrane becomes depolarised by sodium ion channels open which cause more sodium ion channels to open a little further along the axon
5
Q
Passage of an action potential along a myelinated axon
A
Saltatory conduction
6
Q
What is saltatory conduction?
A
Jump of action potential from node of Ranvier to node of Ranvier
