1. The Heart
Lloyd Dean

2. The Heart Structure
• Size and Location
• 3 Layers of Heart Wall
Pericardium (Outer Layer)
Reduce friction & maintain heart shape
Myocardium (Middle Layer)
Largest layer and used in electrical impulse of heart beat
Endocardium (Inner Layer)
Prevent friction between flowing blood and heart muscle

3. The Heart Structure
“Cardium” – Heart
“Peri” – On, around
“Myo” – Muscle
“Endo” – Within, Inward

4. Heart Chambers
RIGHT
ATRIUM LEFT
ATRIUM
RIGHT LEFT
VENTRICLE VENTRICLE
MUSCLE

5. AORTA
PULMONARY ARTERY
PULMONARY VEIN
VENA CAVA
SEPTUM
Septum – Divides the two sides of the heart preventing oxygenated blood
mixing with deoxygenated blood.
Pulmonary Vein – Transports oxygenated blood to the heart.
Aorta – Transports oxygenated blood away from the heart to the body.
Vena Cava – Transports deoxygenated blood from the body back to the heart.
Pulmonary Artery – Transports deoxygenated blood to the lungs.

6. Valves in The Heart
• 4 Valves in the heart
• Bicuspid Valve - Found between the left ventricle and the left atrium and
prevents backflow of blood from the left ventricle to the left atrium. Also
known as Mitrial valve.
• Tricuspid Valve - Found between the right ventricle and the right atrium
and prevents backflow of blood from the right ventricle to the right atrium
• Aortic Valve - Found in the aorta. They prevent backflow of blood into the
left ventricle.
• Pulmonary Valve – Found in the pulmonary artery and prevents backflow of
blood into the right ventricle.
• How do the valves make sure that blood does not flow backwards?
Chordae Tendinae

7. The Heart

8. Blood Flow Through Heart

9. The Heart Structure and Function
• How does the heart receive energy?
• With the person sat next to you describe and draw how
blood flows through the heart
• The heart beats between 80,000 to 100,000 times and
pumps approximately 23,000 litres of blood a day
• That means it will have beat 2-3 billion times and pumped
50-65 million gallons of blood over a 70-90 year lifespan
• Remember to look after it!