Controlling The Heart Beat Flashcards
(5 cards)
1
Q
SAN
A
Initiates the heart beat by stimulating the atria to contract
2
Q
A layer of 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 a wave of excitation to the apex of the heart
5
Q
Purkyne Fibres
A
These branch off the bundle of His and cause the ventricles to contract from the bottom upwards
