7.3.2 Cardiac Cycle

    Cards (14)

    • What is the cardiac cycle?
      Sequence of events in heartbeat
    • During diastole, the heart muscles relax
    • During diastole, atrial and ventricular pressure are low.
    • What happens to atrial pressure during systole?
      Remains low
    • Stages of the cardiac cycle in order
      1️⃣ Atrial Systole
      2️⃣ Ventricular Systole
      3️⃣ Diastole
    • What happens to atrial pressure during atrial systole?
      Increases briefly
    • During ventricular systole, blood is forced into the pulmonary artery and aorta
    • During diastole, both atrial and ventricular pressure decrease.
    • Match the heart valves with their function:
      Atrioventricular Valves ↔️ Prevent backflow into atria
      Semilunar Valves ↔️ Prevent backflow into ventricles
    • What triggers the opening of the atrioventricular valves?
      Atrial pressure > Ventricular pressure
    • The proper opening and closing of heart valves ensure blood flows in the right direction
    • Which neurotransmitter is released by the sympathetic nervous system to increase heart rate?
      Epinephrine
    • The parasympathetic nervous system releases acetylcholine to decrease heart rate.
    • The sympathetic nervous system increases both heart rate and force of contraction.
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