Exam IV - BIO4120 Spring/Summer 2008 EXAM IV 1. The portion...

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B IO4120 Spring/Summer 2008 EXAM IV 1. The portion of the kidney closest to the collecting duct is the a. Loop of Henle b. proximal tubule c. distal tubule d. minor calyx e. major calyx 2. Which of the following statements regarding the movement of filtrate through the nephron is NOT true? a. filtration takes place only in the renal corpuscle b. net solute reabsorption takes place in the descending limb of the Loop of Henle c. the active transport of sodium is the main driving force for most renal reabsorption d. the sodium concentration of the interstitial fluid in the renal cortex is higher than the sodium concentration in the proximal tubule cell 3. Glomerular filtration is favored by the a. hydraulic pressure of the blood in the glomerular capillaries b. osmotic pressure inside the glomerular capillaries c. fluid pressure produced by the displacement of the fluid in the lumen of the tubules d. A and B e. A, B, and C 4. If blood flow through the afferent arterioles increases, a. stretch reflexes trigger vasoconstriction to reduce the flow b. the smooth muscle in the vessel walls stretches to accommodate the increased flow c. the stretch triggers further relaxation of the arteriolar wall, lessening blood pressure d. B and C 5. Glucose is brought into the cytoplasm of kidney tubular cells against its concentration gradient by a. symport with sodium b. harnessing the energy of sodium moving down its electrochemical gradient c. dialysis d. diffusion
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e. A and B 6. One substance has no membrane transporters to move it, but can diffuse freely through open leak channels if there is a concentration gradient. Initially, this substance’s concentration in the filtrate and extracellular fluid are equal. Later, however, the active transport of Na+ and other solutes creates a gradient by removing water from the lumen of the tubule where it is located. What substance is this? a. glucose b. calcium c. urea d. A and B e. A, B, and C 7. Measurements in a nephron reveal a glomerular hydrostatic pressure of 69 mm Hg, and a fluid pressure in the Bowman’s capsule of 15 mm Hg. Assuming that the plasma osmotic pressure is 30 mm Hg and that essentially no plasma proteins are filtered by the glomerulus, what is the net glomerular filtration pressure in this case? a. -6 mm Hg b. 24 mm Hg c. 54 mm Hg d. 84 mm Hg e. 114 mm Hg 8. If the filtration rate of a solute X is greater than its excretion rate, then a. there is net reabsorption of X b. there is net secretion of X c. X is neither reabsorbed nor secreted d. X passes through the nephron without net reabsorption or secretion 9. During the micturition reflex, a. the external sphincter is passively pulled open by the pressure exerted by the urine b. the parasympathetic neuron fires while the motor neurons innervating the external sphincter stop firing c. the internal sphincter is stimulated to contract by the parasympathetic neurons d. the stretch receptors in the bladder prevent the parasympathetic neurons from firing e. the smooth muscle cells lining the bladder are stimulated to relax by the parasympathetic neurons
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Exam IV - BIO4120 Spring/Summer 2008 EXAM IV 1. The portion...

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