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Cardiovascular System - Coggle Diagram

- - - - Diastole: relaxation phase
      - Systole: contraction phase
    - - Ventricles: lower chamber
    - - Atrium: upper chamber
  - - - Pacemaker: electric signal tell heart to contract
      - Cardiac conduction system: 1% of cardiac cells; independent of nervous system; self exciting; generates & conducts electrical signals
      - Pacemaker cells
        
        Sinoatrial node: self exciting; establish heartbeat; atrium
        
        Atrioventricular node: pass contraction signal from atria to ventricles
- - - - Vasodilation: expand
      - Vasoconstriction: shrink
      - Baroreceptor reflex: pressure sensors
  - - - Pulmonary Circuit: blood from heart to lungs; oxygen
      - Systemic Circuit: blood from heart to tissues; subset of systems for heart and liver