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cardiovascular system (blood flow through the heart and body steps (step 1…

- - - - oxygen rich blood from the lungs enters the left atrium through the pulmonary vein.
    - - receives deoxygenated blood from the superior and inferior vena cavas,
  - - - receives oxygenated blood from left atrium, it relaxes and fills blood again
    - - pumps oxygen poor blood to lungs
- - - - Following delay at AV node, the wave of depolarization enters the ventricles and spreads rapidly via bundle branches and Purkinkie fibres= QRS complex on EKG
    - - Ventricles relax and pressure in ventricules falls below that of the atria, leading to passive ventricular filling from atria