Heart
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Cardiovascular
- Cardiovascular Overview
- CO2 Transport
- Heart
- Cardiac Impulse
- Blood Pressure
- Arteries and Arterioles
- Veins and Venules
- Capillaries
- Circulation
- Blood
- Hemoglobin
- Blood Clotting
- Topic Anchor: Heart
- Structure:
- 4 chambers: right atrium, right ventricle, left atrium, left ventricle
- Blood flows from atrium to ventricle
- Left ventricle thicker/more muscular than right ventricle
- Left ventricle must supply systemic circulation (high pressure)
- Right ventricle supplies pulmonary circuit (low pressure)
- 4 valves:
- Atrioventricular valves: prevent backflow into atria
- Tricuspid valve: between right atrium and ventricle
- Mitral/bicuspid valve: between left atrium and ventricle
- Semilunar valves: prevent backflow into ventricles
- Pulmonary semilunar valve: between right ventricle and pulmonary vein
- Aortic semilunar valve: between left ventricle and aorta
- Atrioventricular valves: prevent backflow into atria
- Heartbeat (Cardiac Cycle)
- Diastole:
- Ventricles relax
- Lowest pressure of cardiac cycle
- Atrioventricular (tricuspid and mitral) valves open
- Blood flows from atria to ventricles (filling)
- Ventricles relax
- Systole:
- Ventricles contract
- Highest pressure of cardiac cycle
- Semilunar (aortic and pulmonary) valves open
- Blood pumped out of heart
- Ventricles contract
- Diastole:
- 4 chambers: right atrium, right ventricle, left atrium, left ventricle
- Structure: