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Date: ________________ Section 7.5: The Mammalian Heart Main organ in the circulatory system ______________________ pump Technically: _______ parallel pumps that are synchronized Separated by a thick wall of muscle (______________________) Left Side Right Side Parts Circulation Type Receives oxygenated blood from lungs and sends to body tissues/cells Circulation Description Receives deoxygenated blood from body and sends to lungs Hint Heart Chambers Four ______________________ or “rooms” (2 atria and 2 ventricles) Atria (Atrium) Walls Ventricles Receive Blood from Pump Blood Round and @ top Blood Flow in Heart Into heart Shape & Location _______________ ‘V’ shaped and @ bottom _______________ Leaves heart Heart Valves Prevents ______________________ of blood ______________________ valve found between artia & ventricles ______________________ valve found between ventricles and arteries Major Veins & Arteries Vena Cava ______________________, which come into heart - Superior vena cava comes from ______________________ - Inferior vena cava comes from ______________________ Type of Blood Vessel Types Aorta ______________________, which go way from heart - Aorta goes to ______________________ - Descending aorta goes to ______________________ Section 7.6: Setting the Heart’s Tempo Heart composed of ______________________ muscle o Muscles that contract without external nerve stimulation Sinoatrial (SA) node o Located where vena cava enter the ______________________ o Sends nerve impulse to AV node o ______________________ contract What’s a node? Atrioventricular (AV) node o Located at AV valve in right atrium o Sends nerve impulse through septum to ventricles (through ______________________) o ______________________ contract Controlled by the ______________________ nervous system Sympathetic Parasympathetic When used? effect on heart rate ______________________ are electrical impulses displayed on a graph (Figure 3, page 260) Section 7.7: Heart Sounds lubb-dubb caused by ______________________ Diastole: ______________________ of heart o Atria fill with blood & contract, AV valves ______________________ o Blood enters ventricles & contract, AV valves ______________________ = lubb o Blood pushed into arteries through semilunar valves Systole: ______________________ of heart o Ventricles relax & increase in volume o Blood drawn toward ventricles from arteries o Semilunar valves ______________________ = dubb o Blood stays in arteries Section 7.8: Blood Pressure Measured by a ______________________________ (a.k.a. blood pressure cuff) Measures two pressures: o When ventricles contract (______________________) o When ventricles relax (______________________) Varies by artery: ______________________ with distance from ventricles Blood Pressure Regulation 1. Cardiac output: Any increase = ______________________ blood pressure 2. Arteriolar resistance/diameter: Constriction (more blood in artery) = ______________________ blood pressure Dilation (less blood in artery) = ______________________ blood pressure If CO2 & lactic acid build-up during ______________________ o Smooth muscles relax & arterioles ______________________ o Delivers more ______________________ to tissues Blood Pressure Problems Too Low Too High Problems Figure 3, page 265 Adjustment