1.1.5 - Cardiac Cycle Flashcards
What Is The Cardiac Cycle?
A series of events that take place in one heart beat, including muscle contraction and relaxation.
During Contraction Of The Heart, What Occurs?
Systole.
During Relaxation Of The Heart, What Occurs?
Diastole.
What Does Contraction Of The Heart Muscle Cause?
A decrease in volume in the corresponding chamber of the heart, which then increases again when the muscle relaxes.
When The Volume Of Blood Decreases, What The Happens To The Pressure?
Pressure increases.
When The Volume Of Blood Increases, What Then Happens To The Pressure?
Pressure decreases.
What Happens During Ventricular Diastole & Atrial Systole?
(4 Points)
~ Ventricles are relaxed, atria contract.
~ Decreasing volume and increasing pressure inside the
atria.
~ Pushing blood into the ventricles due to pressure in the atria rises above that in the ventricles, forcing the AV valves open.
~ There is a slight increase in ventricular pressure and volume as the ventricles receive the blood from the contracting atria.
What Happens During Ventricular Systole & Atrial Diastole?
(4 Points)
~ Atria relax, ventricles contract
~ Increasing pressure, decreasing volume inside the ventricles.
~ AV valves close, due to higher pressure in ventricles than the atria.
~ The pressure in the ventricles is higher than the aorta and the pulmonary artery, forcing the SL valves open to force blood into the arteries.
What Happens During Cardiac Diastole?
(5 Points)
~ Ventricles and atria are both relaxed.
~ The higher pressure in the pulmonary artery and aorta closes the SL valves, preventing back flow into the ventricles.
~ The atria continue to fill with blood
~ Blood returns to the heart via the vena cava and pulmonary vein.
~ Atrial systole and ventricular diastole begins.
During The Diastole Stage In The Cardiac Cycle, What Happens In Regards To The AV & SV valves?
(2 Points)
~ AV is open.
~ SV is closed.
During The Systole Stage In The Cardiac Cycle, What Happens In Regards To The AV & SV valves?
(2 Points)
~ AV is closed
~ SV is open.
What Occurs At Point A
End of cardiac diastole.
What Occurs Between Points A & B?
Atrial systole.
What Occurs At Points B & C?
Ventricular systole.
What Occurs At Point D & E?
Cardiac diastole.
Calculate The Heart Rate Of This Person. Give Your Answers In BPM
(4 Points)
~ 1 cardiac cycle = 0.7 seconds.
~ 1 / 0.7 =1.43 beats in 1s.
~ 1.43 x 60 =85.71 beats in 1m.
~ 85.71 BPM.