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
The Heart Structure“Cardium” – Heart“Peri” – On, around“Myo” – Muscle“Endo” – Within, Inward
Heart Chambers RIGHT ATRIUM LEFT ATRIUM RIGHT LEFT VENTRICLE VENTRICLE MUSCLE
AORTA PULMONARY ARTERY PULMONARY VEIN VENA CAVA SEPTUMSeptum – 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.
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
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!