electrical control of the heart Flashcards
what node initiates an electrical impulse
SAN (sinoatrial node)
where does the electrical impulse travel to first
the walls of the atria
what does the electrical impulse cause the atria to do
contract simultaneously
what prevents it from spreading to the ventricles
a thin layer of connective tissue (non-conductive tissue)
where does the electrical signal go to
AVN (atrioventricular node)
what happens at the AVN
electrical impulse is delayed = allows full contraction of the atria
what does the electrical impulse travel down after the AVN
bundle of His (conductive tissue in the septum)
what happens when it reaches the apex of the ventricles
causes the ventricles to contract
what does the electrical signal travel through after contracting the ventricles
the purkinje fibres up the side of the ventricles from bottom up
what happens at ventricular systole (to do with movement of blood)
blood is forced into the arteries
what happens to the electrical impulse after ventricular systole
it is terminated as there is no more conductive tissue
what happens at the end of the cycle
diastole
