drive - action potentials Flashcards
1
Q
What allows Na+ ions to enter the neurone?
A
A neurotransmitter binding to a specific ligand-gated ion channels on the post-synaptic membrane
2
Q
What is initial depolarisation?
A
The initial inflow of Na+ causes the inside of the neurone to become slightly more positive.
3
Q
What does initial depolarisation stimulate?
A
The opening of more voltage gated Na+ channels = further entry of Na+ (thus further depolarisation
4
Q
What is the critical threshold potential?
A
-55mV
