PracticeExam4A

PracticeExam4A - BISC220 Exam 4(Version A Spring 2006...

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BISC220 – Exam 4 (Version A) Spring 2006 Herrera 1. A female patient showed up at the student health center in severe distress. Upon examination, she admitted a history of bulimia, i.e., frequent, self-induced vomiting in order to lose weight. She was severely underweight, and had depressed respiration at 6 breaths/min (normal is 12). Her blood work was also abnormal, showing very high levels of HCO 3 - , dangerously high pH, and low levels of P CO2 . Explain why her bicarbonate levels were so high. 2. Which one of the following statements is false? a. For each cardiac cycle, the volume of blood pumped out of the left ventricle is equal to the volume of blood pumped out of the right ventricle. b. Both angiotensin II and antidiuretic hormone tend to raise blood pressure. c. If plasma protein concentration falls to a low level, it is likely that edema will result. d. Eating a bag of salty pretzels is likely to cause a decrease in secretion of atrial natiuretic hormone. 3. Why does applying constant pressure to an edematous part of the body reduce the swelling? (b) a. Applied pressure causes local release of histamine, which increases tissue drainage. b. Applied pressure has the same effect as the osmotic pressure exerted by solutes in capillaries. c. The applied pressure compresses the edematous fluid and thus directly reduces its volume. d. The applied pressure opens precapillary sphincters. e. The applied pressure opens valves in lymph ducts. f. None of the above is correct. 4. Would blood pH in a person with emphysema tend to be low, normal, or high? Explain the pathological conditions and compensatory mechanisms that underlie your answer. 5. Read the following statements carefully and entirely, and then write either the word “higher” or “lower” in each blank so that the resulting sentences are true statements. During inspiration, the air pressure in the alveoli is ______ (higher/lower) than the air pressure in the external environment. During expiration, air pressure in the alveoli must be _______ (higher/lower) than air pressure in the external environment. At all times, air pressure in the narrow space between the outside of the lung and the inside of the chest wall must be ______ (higher/lower) than alveolar air pressure and _____ (higher/lower) than external air pressure. 6. Which one of the following cell types is most directly involved in attacking body cells infected by viruses? a. neutrophils b. monocytes
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c. eosinophils d. dendritic cells e. natural killer cells f. macrophages 7. A pregnant mother had two blood samples taken, one from herself and one from her late- term fetus. In the clinical laboratory, the technician panicked when he lost track of which vial was which. Fortunately, he remembered a few things from his biology class, including the fact that fetal and maternal hemoglobin differ in functionally important ways. So, he generated an oxygen dissociation curve for both samples and this allowed him to positively identify which blood sample was maternal and which was fetal. a.
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PracticeExam4A - BISC220 Exam 4(Version A Spring 2006...

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