heart Flashcards
What is the correct sequence of flow of an electrical impulse through the heart?
SA node, AV node, AV bundle, Purkinje fibers
Nervous regulation of the heart originates in the…
Medulla oblongata
The T wave on an ECG is due to…
Ventricular repolarisation
Internally, the right and left halves of the heart are separated by the…
interatrial and interventricular septa
The sinoatrial node…
contains autorhythmic fibers that repeatedly generate action potentials
Veins in the myocardium drain into the
coronary sinus
When the ventricles relax
ventricular pressure drops
The atrioventricular (AV) bundle (bundle of His)…
is the only site where action potentials can conduct from the atria to the ventricles
Ventricular systole is caused by
ventricular depolarization
The outer layer of the heart, called the epicardium, is also the
visceral layer of the pericardium
The protective membrane surrounding the heart is called the
pericardium
The thin layer of endothelium lining the interior chambers of the heart is the
endocardium
what does the interatrial septum do?
prevents blood in the right atrium from mixing with blood in the left atrium
what transmits the action potential from the apex of the heart to the ventricles
Purkinje fibers
