1. CARDIORESPIRATORY SYSTEM

4. CARDIOVASCULAR SYSTEM RESPIRATORY SYSTEM Transportation of nutrients, gases, and waste Protection from infection and blood loss Maintenance of body temperature Supply blood with oxygen Removal of carbon dioxide

5. CARDIOVASCULAR SYSTEM BLOOD VESSELS “the roads, railway tracks, and airways of the body” Arteries Veins Capillaries BLOOD VESSELS “the roads, railway tracks, and airways of the body” Arteries “freeway” – carry blood AWAY from the heart Veins – carry blood TOWARDS the heart Capillaries “side streets”– tiny, ‘hair-like’ blood vessels where gas exchange occurs

6. CARDIOVASCULAR SYSTEM Heart – pump of the body About the size of your fist Your heart is a muscle (remember involuntary cardiac muscle!) that contracts and relaxes automatically approximately 70 beats per minute at rest The heart is divided into a right and left half – each are pumps and ensure there’s no mixing between oxygenated blood and deoxygenated blood Each half of the heart is in charge of pumping blood through different blood vessel circuits

7. THE HEART 4 chambers of the heart Atria – right/left Ventricles – right/left Valves – ensure blood flows in a one direction tricuspid, pulmonary, mitral (bicuspid), aortic Veins – carry blood TOWARDS the heart Superior Vena Cava Inferior Vena Cava Pulmonary Vein* Arteries – carry blood AWAY from the heart Pulmonary Artery* Aorta Septum – separates the left and right ventricles septum

8. BLOOD FLOW THROUGH THE HEART

9. Oxygenated blood enters the left atrium through the pulmonary veins* The left atrium pumps the blood through the mitral valve into the left ventricle The left ventricle contracts and pumps the blood through the aortic valve towards the body systems where the oxygen is delivered through the capillaries The deoxygenated blood is transported back towards the heart through the veins. The superior and inferior vena cava both transport deoxygenated blood to the right atrium The right atrium contracts and pumps the blood through the tricuspid valve The right ventricle pumps the blood through the pulmonary valve to the pulmonary artery* which delivers the deoxygenated blood to the lungs where it become oxygenated blood through gas exchange in the capillaries The pulmonary vein then transports the oxygenated blood to the left atrium where the cycle is continued (about 70 times per minute!) *????????

10. ACTIVITY TIME 1.Turn to page 36 in your PINK notebook LABEL THE HEART COLOUR THE OXYGENTATED HALF IN RED AND THE DEOXYGENTATED HALF IN BLUE 2. Time-permitting: in groups of 3, create a song, skit, or comparison to explain the blood flow through the heart.