The Cardiovascular and Respiratory Systems - Heart's Conduction System Linked To Cardiac Cycle

• Heart has dual-pump action
• 2 separate pumps, work simultaneously to pump blood to two different destinations
  • Right side pumps deoxygenated blood towards lungs
  • Left side pumps oxygenated blood towards rest of body

Conduction

• Heart is myogenic - generates/controls it's own electrical impulse called cardiac impulse
• Cardiac impulse initiated from SA node in right atrium
• Impulse passes through right and left atrium walls to AV node - Causing both atria to contract, known as Atrial systole
• AV node conducts impulse down through bundle of HIS
• Down through left and right bundle branches to Apex of heart
• Impulse travels up around ventricle walls via purkinje fibres, causing both…