The document describes the cardiac conduction system and cardiac cycle. It explains that the SA node sends a stimulus to the AV node which travels through the Bundle of His and Purkinje fibers. This causes atrial systole where the atria contract and blood moves from the atria to the ventricles. Then ventricular systole occurs where the ventricles contract and blood is pumped from the lungs and body. Between contractions is diastole where the atria and ventricles fill with blood.

1. Anatomy

2. Conduction System

3. Bundle of His
Purknjie
Fibres
Conduction system.MP3

4. Conduction Cardiac Cycle Blood
SA node sends stimulus to AV Atrial Systole LA to LV
node RA to RV
AV Node to Bundle of His and Ventricular Systole LV to body via Aorta
Purkinje Fibres RV to lungs via Pulmonary
Artery
Nothing! Diastole From body to RA via Vena Cava
From lungs to LA via Pulmonary
Vein
Deoxygenated blood Atria fill with Oxygenated
enters RA from Vena blood blood arrives
Cava at LA from
lungs via
Right Pulmonary
Atrium Left
Vein
Atrium
Right Left
Ventricle Ventricle Oxygenated
Deoxygenated blood leaves LV
blood leaves RV to in aorta to the
the lungs via Ventricles fill body
Pulmonary Artery with blood

5. Conduction Cardiac Cycle Blood
SA node sends stimulus to AV Atrial Systole LA to LV
node RA to RV
AV Node to Bundle of His and Ventricular Systole LV to body via Aorta
Purkinje Fibres RV to lungs via Pulmonary
Artery
Nothing! Diastole From body to RA via Vena Cava
From lungs to LA via Pulmonary
Vein
Deoxygenated blood Atria fill with Oxygenated
enters RA from Vena blood blood arrives
Cava at LA from
lungs via
Right Pulmonary
Atrium Left
Vein
Atrium
Right Left
Ventricle Ventricle Oxygenated
Deoxygenated blood leaves LV
blood leaves RV to in aorta to the
the lungs via Ventricles fill body
Pulmonary Artery with blood