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Structure of the Heart

Last updated May 26, 2023 Edit

# Diagram of Heart Structure

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# Cardiac Cycle

AV = Atrioventricular SL = Semi-Lunar

# Control of the Cardiac Cycle

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  1. Electrical activity from SAN spreads through both atria—triggering a contraction of the atria.
  2. Electrical activity can’t pass through the atrioventricular septum, but can pass through the atrioventricular node (AVN).
  3. A short delay before AVN conducts electrical activity down to the base of the ventricles (ensures atria finish contracting and ventricles are full of blood).
  4. Electrical activity travels to base of ventricles (ensures atria finish contracting and ventricles are full of blood).
  5. Electrical activity travels to the base of ventricles via the bundle of His.
  6. Ventricles contract from the base upwards.

Circulatory