Exam 4 Practice Spring 2005

Exam 4 Practice Spring 2005 - Sample Final Exam Questions...

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1 Sample Final Exam Questions BISC 220, Spring 2005 Prof. Albert Herrera 1. In the epithelial cells that line the lumen of the jejunum, why is the Na+/K+ pump necessary for the uptake of amino acids? a. When amino acid concentration is high, as it is during digestion, the Na+/K+ pump can actively transport amino acids into the cell. b. Since the Na+/K+ pump makes the inside of the cell negative, and most amino acids are positively charged, the pump facilitates the inward movement of amino acids through amino acid channels. c. The Na+/K+ pump helps create an osmotic gradient that causes water to move into the cell, dragging dissolved amino acid molecules in the same direction. d. By creating an electrochemical gradient for Na+ influx, the Na+/K+ pump makes possible Na+-dependent co-transport of amino acids. e. The Na+/K+ pump is not necessary for the uptake of amino acids; it does not play a direct or indirect role. 2. What is the functional significance of the fact that a decrease in pH lowers the affinity of hemoglobin for oxygen? 3. Air enters the lungs of mammals during inspiration because a. smooth muscle cells lining the bronchi and bronchioles contract, causing airway volume to increase. b. the pressure of the alveolar air increases. c. the diaphragm muscle moves upward when it contracts. d. pulmonary muscles pull on the outer surface of the lungs. e. the volume of the thoracic cavity increases. 4. Oxygen will diffuse out of capillaries into surrounding tissue faster in response to which one of the following conditions? a. an increase in P O2 in the tissue b. a decrease in P O2 in the tissue c. an increase in thickness of the capillary wall d. a decrease in the surface area of the capillary e. an increase in thickness of the extracellular space between the capillary and surrounding cells 5. Which one of the following does not contribute to renal filtration? a. high hydrostatic pressure in glomerular capillaries b. large surface area for filtration c. permeability of glomerular capillaries d. podocytes e. active transport by the epithelial cells of Bowman’s capsule 6. Before puberty, a. the hypothalamus secretes very low levels of GnRH.
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2 b. the pituitary secretes FSH and LH but the gonads are unresponsive. c. testosterone does not play a role in the development of male sex organs. d. genetic females will develop male genitals unless testosterone is present. e. boys can stimulate massive muscle development through a vigorous training program. 7. While recovering from a severe traumatic blow to the head, a patient developed diabetes insipidus, a condition that has two characteristic symptoms: production of a very large volume of dilute urine and insatiable thirst. A brain scan revealed a focus of damage in the part of the hypothalamus that sends axons to the posterior pituitary. Briefly explain what is likely wrong with this patient. Explain both of the characteristic symptoms. 8. Which one of the following activities is most likely to result in increased production of renin?
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Exam 4 Practice Spring 2005 - Sample Final Exam Questions...

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