Presentation on theme: "Cardiovascular System Chapter 42 IB Biology. Biological Function of Cardiovascular System T R A N S P O R T ! –Maintains constant flow of : Nutrients."— Presentation transcript:
Protective Features of the Heart P E R I C A R D I U M Layered membrane surrounding heart Fibrous pericardium –Tough, superficial layer Serous pericardium –Thin, deep layer subdivided into: Parietal layer: lines underside of fibrous pericardium Epicardium: lines external surface of heart Pericardial cavity: btwn parietal layer and epicardium filled with fluid!
Internal Heart Anatomy FOUR CHAMBERS 2 ATRIA (Right Atrium, Left Atrium) Entry Chambers 2 VENTRICLES (Right Ventricle, Left Ventricle) Exit Chambers
Right atrium Left atrium Right ventricle Left ventricle
So what’s the big deal about a four chambered heart? E F F I C I E N C Y
What leads to the heart’s efficiency? A T R I O V E N T R I C U L A R S E P T U M wall that creates a physical separation between right and left sides of heart (Interatrial septum + Interventricular septum = Atrioventricular Septum)
How does the AV septum lead to efficiency? Creates two hearts in one! Maintains separation between oxygenated blood (high O 2 / low CO 2 ) and deoxygenated blood (low O 2 / high CO 2 ) Oxygenated blood always on left side! Deoxygenated blood always on right side!
The Heart’s Assignment… …maintaining blood flow through ALL circulatory pathways of the body!
Right side receives blood from tissues and pumps to lungs (pulmonary circulation) Left side receives blood from lungs and pumps to tissues (systemic circulation)
Pathway of Blood Through the Heart Heart acts as double pump (Rt side/left side) Both pumps act in unison Deoxygenated blood returns to heart through vena cava Right side pumps blood to lungs Oxygenated blood returns to heart through pulmonary veins Left side pumps blood to body