lecture 2 - Lecture Professor Julian Schroeder I. Functions...

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1 Lecture Professor Julian Schroeder I. Functions of Circulation II. The Heart and Circulation III. Blood Pressure INTERNAL HOMEOSTASIS Figure 40.4
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2 A. Transport controls rate of supply according to need (heartbeat) B. Diffusion is too slow dilution of nutrients ~ (distance) 2 diffusion time is proportional to (distance) 2 I. FUNCTIONS OF CIRCULATION Pumped Transport versus Diffusion Circulatory Schemes of Vertebrates Figure 42.5
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3 II. FUNCTIONS OF CIRCULATION A. General Structures ATRIUM The two chambers of the heart that receive incoming blood (collection) VENTRICLES The two chambers of the heart that pump blood out of the heart (ejection) ARTERIES: carry blood away from the heart VEINS: return blood to the Atria of the heart Lecture Professor Julian Schroeder B. Heart functions as a pump Figure 42.6
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4 II. FUNCTIONS OF CIRCULATION C. The Heart Cycle: Sequence of events RIGHT SIDE OF HEART 1) Right atrium fills from Vena Cava 2) Right ventricle fills via atrioventricular valve 3) Atrium contracts ventricle fills 4) Ventricle contracts atrioventricular valve closes 5) Semilunar valve opens 6) Blood pumped to lung II. FUNCTIONS OF CIRCULATION LEFT SIDE OF HEART 1) Left atrium fills from lung 2) Left ventricle fills 3) Atrium contracts 4) Ventricle contracts 5) Oxygenate blood pumped to body Cyanosis
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This note was uploaded on 04/19/2010 for the course BIOLOGY bild 2 taught by Professor Schroeder during the Spring '09 term at UCSD.

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lecture 2 - Lecture Professor Julian Schroeder I. Functions...

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