When atrial pressure is greater than ventricular pressure, the---- valves open.
When ventricular pressure rises above atrial pressure, the blood in the ventricle pushes the----- valves closed.
when the pressure in the --------- is greater than the pressure in the arteries, the semilunar valves are forced open.
When ventricular pressure is lower than -------pressure, arterial blood holds the semilunar valves closed.
QRS complex or
Atrial contraction or atrial systole
Ventricular contraction or ventricular systole
Place the locations of the heart's conducting system in order, beginning with the location where the heartbeat is initiated.
Left and right bundle branches
Name all that occur during ventricular systole.
- The AV valves open to allow blood to enter the ventricles from the atria.
- The semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles.
- The semilunar valves open to allow blood to flow into the large arteries.
- The AV valves close to prevent backflow of blood into the atria.
During the depolarization phase of cardiac muscle?
voltage-gated sodium channels open.
Put the steps of the cardiac cycle into the correct order, starting with the beginning of the cardiac cycle.
Atrial contraction and ventricular filling
Atrial relaxation and ventricular filling