How the heartbeat is controlled Flashcards
(5 cards)
1
Q
SAN
A
Initiates the heart beat by stimulating the atria to contract.
2
Q
Collagen Fibres
A
Prevents direct electrical flow from atria to ventricles
3
Q
AVN
A
Picks up the electrical activity from the SAN and imposes a slight delay.
4
Q
Bundle of His
A
Receives electrical activity from the AVN and conducts the wave of excitation to the apex (base) of the heart.
5
Q
Purkyne Fibres
A
These branch off the bundle of His, causing the right and left ventricles to contract from the bottom upwards
