Heart, Conduction System, ECG Flashcards
function of right atrium
receive blood from the systemic circuit
function of right ventricle
push blood into the pulmonary circuit
function of left atrium
receive blood from the pulmonary circuit
function of left ventricle
push blood into the systemic circuit
where are the AV valves
bicuspid AV valve= left ventricle
tricuspid AV valve= right ventricle
linked with papillary muscles, tension in the chordae tendineae
what are the semi-lunar valves
tricuspid valves: 1. pulmonary semi-lunar valves 2. aortic semi-lunar valves
not linked with papillary muscles
what does myogenic mean
signals itself
what does autorhythmicity mean
can generate its own rhythm
what do pacemaker cells do
spontaneously generate an AP
what are conduction fibres
propagate the AP
where are pacemaker cells found
in the SAN (upper right atrium)
in the AVN (near tricuspid valve)
what do contractile cells do
contract to produce the contraction
what are the conducting pathways in the ATRIA
intermodal pathway: SAN–>AVN
OR
contractile–> contractile ——> AVN
what are the conducting pathways in the VENTRICLES
AV bundle of HIS in ventricle branches into—> purkinje fibres–> papillary muscles of right ventricle via moderator band
why is there rapid transmission of AP
- all the cardiac cells are connected by gap junctions
- all the cardiac cells are held together by desmosomes
- all the cardiac cells have interrelated discs between them
