lecture_notes_18_(ta)

lecture_notes_18_(ta) - (TA NOTES IN RED Lecture 18...

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(TA NOTES IN RED ) Lecture 18: Cardiovascular System - Cardiac Physiology Reading: chapter 9, section: anatomical considerations, pgs 299-305 (pgs 303-310, if using 5 th edition) chapter 9, section: electrical activity of the heart, pgs 305- 308 (pgs 310-312, if using 5 th edition) Anatomy of the Heart – The ( MAMMALIAN ) heart is a dual-pump system composed of 4 chambers, the left and right ( 1 ) Atria , and the left and right ( 2 ) Ventricles (Figure 9-1, 9-2a) . The chambers on the right pump oxygen-poor blood ( WHICH IS BLUE ) through the pulmonary circulation to the lungs ( WHICH , OF COURSE , ABSORB 0 2 AND RELEASE CO 2 ) , and the chambers on the left pump oxygen-rich blood ( WHICH IS RED ) through the systemic circulation to the body tissues (Figure 9-1,9-2b) . ( NOTE : THE ATRIA MERELY PUMP BLOOD INTO THE VENTRICLES ; THEY PRIME THE VENTRICLES BY FORCING BLOOD INTO THEM . T HE VENTRICLES ARE THE MOST IMPORTANT PUMPING CHAMBERS ) Chambers and Valves (Figures 9-2,9-3,9-4,9-5) Four Chambers : 1 Right atrium 2 right ventricle 3 left atrium 4 left ventricle Four valves : ( VALVES FUNCTION TO ENSURE THE FLOW OF BLOOD IS UNIDIRECTIONAL . ) 1 right A TRIAL - V ENTRICULAR valve / tricuspid 2 pulminary / semilunar valve ( FROM RIGHT VENTRICLE TO PULMANORY - LUNGS ) 3 left AV valve / bicuspid/mitral 4 aortic / semilunar valve ( FROM THE LEFT VENTRICLE TO AORTA -- SYSTEMIC CIRC . ) ( 1 ) Right Atrium - receives oxygen-poor blood from the systemic venous circulation via the inferior and superior vena cava veins. Pumps blood into the right ventricle through the right atrioventricular (AV) (tricuspid) valve . ( 2 ) Right Ventricle - receives oxygen-poor blood from the right atrium and pumps the blood through the pulmonary (semilunar) valve into the pulmonary artery . This artery branches to form the left and right
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