Sinoatrial and Atrioventricular Node
Define pacemaker
a device that automatically self-excites at a faster rate than the rest of the heart initiating the heart beat
What is the sinoatrial node?
a small mass of specialized cardiac muscle
Where are purkinje fibers grouped together? What is also known as?
in the atrioventricular bundle also known as the Bundle of His
Where is the SA node located?
in the right atrium between the orifice of the superior vena cava and the auricle
Intermingled with the atrial muscle fibers are the...
internodal fiber bundles
The SA node is the biological...
pacemaker
Where is the AV node located?
right atrium, lower part of the interventricular septum
The fibers of the SA node are fused to what?
surrounding atrial muscle tissue
Why can impulses not directly travel from atria to ventricle?
the fiberous skeleton
The fiberous skeleton makes...
two separate systems
Purkinje fiber conduction is how fast?
very rapid at 1.5-4 meters per second
