Action Potentials Flashcards
1
Q
Why is the SA node the pacemaker of the heart?
A
Fastest to depolarise,
Whichever site can depolarise the fastest will always be the pacemaker therefore the SA node gets the job
2
Q
What other fibres in the heart (aside from the nodes) have pacemaker potential?
A
Purkinje fibre
They have fast sodium channels to help it conduct quickly
Unstable rmp like a conducting cell
3
Q
What occurs if action potentials fire to slowly in the heart?
A
Bradycardia
4
Q
What occurs if action potentials fail in the heart?
A
Asystole
5
Q
What occurs if action potentials in the heart fire too quickly?
A
Tachycardia
6
Q
What occurs in the heart if the electrical activity becomes random?
A
Fibrillation
7
Q
If you get ventricular fibrillation what can you lose?
A
Cardiac output
