01:119:116 Lecture Notes - Lecture 25: Gastrovascular Cavity, Pulmonary Valve, Stroke Volume
12 Jun 2017
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Lecture 25 circulatory system: basics of circulatory systems, types of circulatory systems. A. a)some animals do not have a circulatory system (a. a. 1) Closed (a. c. 2. i) blood straight to cells: vertebrate circulation. Arteries arterioles capillaries tissues venules veins. B. g)pericardium: connective tissue sac encloses heart: comparison of vertebrate circulatory systems. C. a)fish low metabolic rate, slow system (c. a. 1) Two chambered heart 1 atrium, 1 ventricle (c. a. 3) C. b)amphibian low metabolic rate, slow system (c. b. 1) Three chambered heart 2 atria, 1 ventricle (c. b. 3) Pulmo-cutaneous circuit: oxygen picked up from skin (c. b. 4) Systemic circuit to body returns to right atrium. Double circulation more vigorous blood flow (c. c. 2) Four chambered heart 2 atria, 2 ventricles (c. c. 3) A. a)cardiac output blood pumped/min by left ventricle (a. a. 1) Heart rate = # strokes/minute ~60-100 bpm (a. a. 3) Stroke volume amount of blood pumped in single contraction. Between atrium and ventricle: blood passes atrium ventricle (a. b. 1. i)right av (tricuspid) (a. b. 1. ii) Semilunar ventricles to heart exit (a. b. 2. i)pulmonary valve (a. b. 2. ii) Autorhythmic generates ap"s by ca channels (b. a. 2)
