pathway of blood

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  • 1. t h e p a t h w a y b l o o d t a k e s t h r o u g h t h e h e a r t

2. t h e p a t h w a y b l o o d t a k e s t h r o u g h t h e h e a r t 3. t h e p a t h w a y b l o o d t a k e s t h r o u g h t h e h e a r t 4. t h e p a t h w a y b l o o d t a k e s t h r o u g h t h e h e a r t 5. A Quick Look at the Anatomy of the Heart 6. An Overview of Today: 7. Deoxygenated( blue )(1)blood returns to theright atrium ( 2)via three major blood vessels.These are the: 1.Superior Vena Cava (3 ) returns venous blood to the heart from the upper body 2.Inferior Vena Cava (4 ) returns venous blood to the heart from the lower body 3.Coronary Sinus (5 ) returns venous blood to the heart from the heart. 3 4 (opening of coronary sinus) 5 2 8. Deoxygenated blood then passes from the right atrium through the three-flapped atrioventricular ortricuspid valve (6) and into theright ventricle (7) . S.V.C. I.V.C. C.S. R.A. 6 7 9. The right ventricle contracts vigorously to pump the deoxygenated blood out through thepulmonary semilunar valve (8)and into a large artery called thepulmonary trunk (9) . T.V. R.V. 8 9 10. The pulmonary trunk immediately branches to form theleft and right pulmonary arteries (10) . These arteries carry the deoxygenated bloodaway fromtheheartandtothealveoliof thelungs (11) . P.T. P.S.V from heart to heart 11 (alveolus) 10 10 11. ox. blood Deox. blood from heart to heart 12 In thecapillary network (12)of the lungs the deoxygenated bloodexchanges (13)its load ofcarbon dioxide (14)for a fresh supply ofoxygen (15) .The blood then is termedoxygenated( red )(16)blood. 12. As the oxygenated blood exits the capillary network of the lungs, it enters theleft & right pulmonary veins (17)which carry the oxygenated bloodawayfrom thelungsandback totheleft atrium (18)of the heart. S.V.C. I.V.C. R.A. C.S. T.V. R.V. P.S.V P.T. 17 17 18 13. Oxygenated blood then passes from the left atrium through the two-flapped atrioventricular orbicuspid valve(19) , also called themitral valve(20) , and into theleft ventricle (21) . R.P.A. L.P.A. 19, 20 21 14. The left ventricle, which is the most muscularly walled chamber of the heart, vigorously contracts in a twisting motion to force the oxygenated blood through theaortic semilunar valve (22) and into the largest artery of the body, theascending aorta(23) . R.P.V. L.A. L.P.V. B.V. 22 23 15. From the aorta the oxygenated blood is delivered to all areas of the body (24)(the exception being the lungs, of course). 16. 17.

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