1. Function

2. Heart Action Systole: Contraction of the heart Diastole: Relaxation of the heart In what order does blood travel through the four chambers of the heart? (Include the essential organ) Right Atrium  Right Ventricle  LUNGS  Left Atrium  Left Ventricle  (BODY)

3. The heart is two separate “pumps” Right side pumps deoxygenated blood to the lungs to: drop off carbon dioxide pick up oxygen Left side pumps oxygenated blood to the cells of the rest of the body to: drop off oxygen pick up carbon dioxide

6. Based on the functions of the right ventricles vs. the left ventricle, how do you think their structures differ? Left ventricle must pump blood to the entire body Right ventricle only has to pump blood to the lungs Therefore, walls of the left ventricle are THICKER (more muscle)

8. Structure  Function!!! What structures in the heart ensure that blood keeps moving forward? VALVES: prevent backflow of blood Valves are attached to walls of the heart via chordae tendinae Prevents inversion of valves