unit 3 heart cycle
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atrial and ventricular diastole
the AV valves are opened, the SL valves are closed
atrial systole (the atrial kick)
accounts for 10-30% of cardiac output. the AV valves are open and the SL valves are closed. at the end, the AV valves close due to increased pressure in the ventricles. this creates the lub (s1).
ventricular systole
the ventricles contract while the atria are in diastole. ventricular pressure overcomes atrial pressure, which opens the SL valves and closes the AV. when the SL valves close at the end due to increased atrial pressure, the dub (s2) occurs. all valves close at the end of this stage.
ventricular diastole
atria and ventricles are diastolic. when atrial pressure rises over ventricular pressure, AV valves open.
circumflex
circles around the lateral wall to the left lateral/posterior wall.
left anterior descending artery
goes to the left anterior wall
right main coronary artery
starts at the right ventricle, goes to the left interior/posterior wall.
what is the position of the AV valves during ventricular systole
closed.
when the AV valves close what direction do they move? when they open?
up. down.
what is the position of the AV valves during ventricular diastole
open
what is the position of the SL valves during ventricular systole
open
what is the position of the SL valves during ventricular diastole
closed
when the SL valves close what direction do they move? when they open?
downward. upward.