01:119:115 Lecture Notes - Lecture 25: Heart Valve, Atrioventricular Node, Pulmonary Artery
8 Jul 2015
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Figure 42. 7 heart circulation: volume of blood pumped by each ventricle = cardiac output a. Influenced by heart rate (rate of contraction: also influenced by stroke volume (amount of blood pumped by ventricles in single contraction, average is 70ml per beat average 72 beats per minute. Figure 42. 8: heart beat heard is; 1rst sound of blood recoiling against av valves when they close. 1c increase in temp raises heart rate by ~10 beats per min. Blood is composed of cells, ions, proteins and water: blood is connective tissue made of cells suspended on liquid matrix of plasma (figure 42. 16, plasma contains ions and proteins that help osmoregulation, transport and defense. Ions (electrolytes) contribute to osmotic balance, ph buffering, membrane permeability: proteins contribute to osmotic balance, ph buffering, material transport and body defense, albumins; help in osmotic balance and ph buffering b.
