Exam_III_2009_Key_Corrected

Exam_III_2009_Key_Corrected - NAME:_ Quantitative...

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NAME:________________________________________ Quantitative Engineering Physiology BME 365R: Quiz 3 December 3, 2009 Questions 1-25 are multiple choice. Each multiple choice question is equally weighted and valued at 3 points. For each question, circle the one answer that you think is most correct. Circle your answer on the Exam sheet AND bubble in your selected answer on the Scantron. Calculators are allowed when working the Exam. 1. Consider a 5cm length of abdominal artery that has a volume of 3ml. If an increase in pressure of 10 mmHg results in a fractional increase in the radius of Δ r/r=0.05, what is the compliance of the artery? A. 0.03 ml/mmHg B. 0.015 ml/mmHg C. 33.3 mmHg/ml D. 66.7 mmHg/ml E. None of the above The change in volume will go as the radius squared so that the change in volume is 0.3ml. The compliance will be C= Δ V/ Δ P=0.3/10 = 0.03 ml/mmHg 2. Consider a vessel with some Young’s modulus, wall thickness, diameter, and Poisson’s ratio. Holding all constants the same, if the diameter increases by 10%, what will be the relative change in the vessel compliance? A. Compliance will increase by 10% B. Compliance will increase by 20% C. Compliance will increase by 30% D. Compliance will decrease by 10% E. None of the above The vessel compliance varies with the cube of the diameter, an increase in the diameter by 10% will give an increase of the compliance by approximately 30%. 3. The chamber(s) of the heart that do not have valves at their entrance include: A. Right atrium B. Right ventricle C. Left atrium D. Left ventricle E. None of the above Valves are always at the output of the chambers – so the left atrium and right atrium do not have valves at the entrance. 4. Consider a heart beating at 70 beats/min with a stoke volume of 70 ml, the cardiac output is: A. 1 ml · min B. 4900 ml/min C. 70 ml/sec D. 4900 mmHg/min E. None of the above 70 beats/min X 70 ml/beat = 4900 ml/min
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NAME:________________________________________ 5. If the left ventricle of the heart discussed in problem 4 does 700 ml · mmHg of work in one beat, the average power provided by the left ventricle is: A. 49,000 ml · mmHg/min B. 4,900 ml · mmHg/min C. 10 ml · mmHg/min D. None of the above The power is the energy per beat multiplied by the beats per min, or 700 X 70 = 49,000 ml · mmHg/min 6. The work done during passive filling of the left atrium with blood originates from: A. Left ventricle B. Lungs C. Right ventricle D. Right atrium E. None of the above The right ventricle pumps blood into the lungs and ultimately the left atrium. 7. If the arterioles relax and develop a larger diameter, the vascular function curve will A. Rotate counter clockwise about the x-intercept B. Rotate clockwise about the x-intercept C. Shift vertically D. Shift horizontally E. None of the above The resistance will decrease which will cause just the slope to increase causing the curve to rotate clockwise about the x-intercept. 8.
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Exam_III_2009_Key_Corrected - NAME:_ Quantitative...

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