heart

• what is the term used for contraction

  systole
• what is the term used for being relaxed

  diastole
• what happens when the heart is at rest

  blood trickles into both atriums via the aorta/pulmonary artery at low pressure

  valves are open so blood trickles into ventricle
• what are the stages of contraction

  heart is at rest

  atrial systole forces remainder of blood into ventricle (ventricular diastole)

  ventricle contracts forcing blood upwards - atrialventricular valves closed, semi lunar valves forced open

  semi lunar valves close to prevent backflow
• what is the term for an abnormally low heart rate

  bradycardia
• what is the term for an abnormally high heart rate

  tachycardia
• what is the term for too many atrial contractions

  atrial fibrillation
• what is the term for too many ventricular contractions

  ventricular fibrillation
• what is the term for abnormal heart activity

  ectopic