BIO 121 Lecture Notes - Hematocrit, Extracellular Fluid, Oxygen Saturation
18 Nov 2013
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Ch 20: the cardiovascular system, blood and heart. The cardiovascular system functions as a system to transport numerous substances throughout the body such as: nutrients, oxygen and carbon dioxide, hormones, ions, transports metabolic wastes to the kidneys, transports leukocytes to aid in fighting infectious agents. Carbon dioxide concentration in plasma is lower. Therefore, carbon dioxide diffuses out of the tissues. Plasma consists of dissolved protein (interstitial fluid does not) Plasma proteins: there are three major classes of protein in the blood. Contributes to the osmotic pressure, transports fatty acids and steroids, smallest of the proteins. Act as transport proteins (transport ions and hormones) Involved in blood clotting, largest of the proteins. Red blood cells (rbcs) or erthrocytes: hermatocrit readings: the percentage of whole blood occupied by the formed elements. Males: 45% (5. 4 billion rbcs per microliter) Females: 42% (4. 8 billion rbcs per microliter: hermatocrit readings are also called: Measure about 7. 7 microns in diameter (1cm= 10,000 microns)
