BIOL 1344 Lecture 1 Outline of Current Lecture I. Qualities of BloodA. pH and specific gravity of bloodB. viscosity of bloodC. Red blood cell countsII. Blood FunctionsA.TransportationB.RegulationCurrent LectureBlood is 8% of body weight. Its red color comes from its oxygenated hemoglobin (hemoglobin + O^2 = oxyhemoglobin). Deoxygenated blood “appears” blue because it absorbs the red wavelengths. Its pH should be about 7.35 in the veins, 7.45 in the arteries. The specific gravity ofblood is 1.05-1.06 for the whole blood, 1.02-1.03 for just the plasma. The viscosity of blood depends on the number and size of particles in the blood. Distilled water has a viscosity of 1.0 and blood as a whole is 4-5 times more viscous than water, plasma is 1.4-2 times more viscous than water. If the red blood cell count becomes too high, blood becomes more viscous, too thick. This results in polycythemia which can be caused by blood doping. If the red blood count becomes too low, this is anemia. Blood functions: 1 - Transports gases such as oxygen and carbon dioxide. 2 - Transports nutrients such as end of digestion products, glucose, free fatty acids, glycerol, cholestoral, amino acids, HDL, LDL, VLDL, and hormones. 3 - Maintains body temperature at 37°C, blood temperature is 38°C. – Blood maintains temperature by distributing heat and causing vasodilation (blood vessels become wider when body is hot) and vasoconstriction (blood vessels become narrower in order to retain heat). These processes are sympathetic and require epinephrine to bind to a receptor to stimulate the body response. These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.5 – Maintains fluid balance. Water is 60% of body weight (40% intracellular, 20% extracellular). The rest of body weight is 36-40% muscles, 18-20% bones. Neutral blood is isotonic which is 300mOsmols/L. If the cells are dehydrated, that is called hypotonic which is 280 mOsmols/L. If there is an abundance of water that is called hypertonic which is 320
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