MT: Cardiovascular System

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Cardiovascular System
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Presentation transcript:

MT: Cardiovascular System I will understand the cycle of blood circulation, conduction of the heart, and how the cardiovascular system works with respiratory system MT: Cardiovascular System

Conduction of the Heart Atrioventricular bundle AKA Bundle of His Sinoatrial node “pacemaker” Interatrial Bundle Atrioventricular node Atrioventricular bundle Purkinje fibers Sinoatrial (SA) node Atrioventricular (AV) node Purkinje Fibers

Conduction of Heart SA node conducts action potential Stimulates the interatrial bundle Left and right atria contract “lub” sound Signal excites AV node Signal travels down septum Signal excites Bundle of His Signal travels through Purkinje fibers Ventricles contract “dub” sound

Blood Flow of Heart 1. Deoxy blood enters right atrium via inferior and superior vena cava 2. Right atrium fills and contracts 3. Blood flows to right ventricle 7. Pulmonary valve closes 5. Right ventricle fills and contracts 6. Blood flows thru pulmonary artery to lungs 4. Tricuspid valve closes

Blood Flow of Heart 8. Blood drops off CO2 and picks up O2 in lungs 9. Oxy blood goes thru pulmonary veins to left atrium 10. Left atrium fills with blood and contracts 12. Blood fills left ventricle and contracts 13. Blood travels through aorta to body 14. Aortic valve closes 11. Mitral valve closes

CO2 O2 The heart and lungs work together to exchange carbon dioxide and oxygen via capillaries.

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