Physiology 2130 Lecture Notes - Lecture 9: Cardiac Muscle, Stroke Volume, Subcutaneous Tissue
25 Dec 2016
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Document Summary
Blood vessels: through these, the blood is distributed to all areas of the body. Circulatory system is closed system of tubes, filled with fluid, pumped around. Capillaries: smallest blood vessels, functional units of circulatory system. Converge: into venuleswhich get larger to form veins. 2 principal loops that blood takes through body. Right side of heart: sends blood through arteries to lungs. Pulmonary capillaries: where gas exchange takes place in lungs. Left side of heart: where oxygenated blood returns to heart. Left side of heart: pumps freshly oxygenated bloodto rest of body. Deoxygenated blood: returns to right side of heart. There are 2 smaller circulatory loops within the larger systemic circulation. Total blood volume (tbv): 5l in average human. 9. 7: blood velocity and cross-sectional area of vessels. Venules/veins: both blood pressure and cross sectional area increases. Concentration gradient: driving force moving ions during diffusion. Pressure gradient: force that moves blood through circulatory system.
