Function: Distributes oxygen and nutrients throughout the body

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Function: Pump blood throughout body Two Main Pathways: 1) Pulmonary circulation –Between heart & lungs –Oxygen-poor blood 2) Systemic Circulation –Between heart & body –Oxygen-rich blood Click picture to play

4 Chambers Blood flows from atrium to ventricles Valves ensure one way flow Septum

1) Deoxygenated (used) blood enters right atrium

2) Blood pumped from right atrium into right ventricle Valve prevents backwards flow

3) From the right ventricle, blood travels through the pulmonary arteries towards the lungs

Deoxygenated (used) blood enters lungs Gases exchanged with alveoli Oxygenated (new) blood returns to heart

4) From the lungs, oxygenated blood enters the left atrium through the pulmonary veins

5) Blood pumped into left ventricle Valve prevents backwards flow

6) Left ventricle pumps blood to aorta Aorta directs oxygenated blood throughout the body

Quick Review Deoxygenated blood is pumped towards the lungs Lungs remove CO 2 and add O 2 Oxygenated blood returns to heart