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Unformatted text preview: L100 Quiz #2 ANSWER KEY 1. Jimmy's blood pressure is 107/65. What does the "107" represent and what does the "65" represent. Be sure to be specific. (2pts) The "107" is the systolic pressure, which is the pressure in the arteries during ventricular contraction. The "65" is the diastolic pressure, which is the pressure in the arteries when the ventricles relax. 2. Gas exchange takes place in the lungs. Air coming into the alveoli is rich in _____oxygen______________ and has low levels of ______carbon dioxide________. (1pt) 3. Using the information provide in the graph answer the following questions: a. In what vessels does the blood move the slowest? Explain. (1pt) Blood most the slowest in the capillaries due to the dropping pressure as the blood moves away from the heart and the increase area of the vessels as the arterioles branch into many capillaries. b. In which vessels is the blood pressure the lowest? Explain. (1pt) Blood pressure is lowest in the veins. The pressure has dropped as it moves away from the heart, and the lumen of a vein is wide, which also results in a loss of pressure. 4. Explain negative pressure inhalation. (1.5pts) In negative pressure inhalation the lungs are filled as a result of a drop in pressure that draws the air into the body. The expansion of the chest cavity through the contraction of the intercostal muscles and the diaphragm results in a drop of pressure inside the lungs (more space for the same volume of air), making the pressure less than atmospheric pressure. The pressure difference created will draw air into the lungs. 5. In the figure below label all of the parts listed. In addition, color in dark all of the areas containing oxygenrich blood and lightly all the areas with oxygenpoor blood. Alternatively you can use solid color vs. hash marks or something but you need to make sure it is obvious which is which. (5.5 pts) Label: aorta, vena cavae, veins, arteries, capillaries, right atrium, right ventricle, left ventricle, left atrium, pulmonary vein, pulmonary artery ...
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This note was uploaded on 01/18/2012 for the course L 100 taught by Professor Dr.susanhengeveld during the Fall '11 term at Indiana.
- Fall '11