renal 3

3/27/24, 11:01 PM PhysioEx Exercise 9 Activity 3 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex9/act3/ 1/4 PhysioEx Lab Report Exercise 9: Renal System Physiology Activity 3: Renal Response to Altered Blood Pressure Name: b Date: 27 March 2024 Session ID: session-71685c69-e38d-e885-b92a-9770e9cf7101 Pre-lab Quiz Results You scored 0% by answering 0 out of 4 questions correctly. Experiment Results Predict Question If all other variables are kept constant, how does the afferent arteriole radius affect the rate of glomerular filtration? You did not answer this question. Correct answer: An increased afferent arteriole radius will increase the rate of glomerular filtration. 1 If all other variables are kept constant, how does the efferent arteriole radius affect the rate of glomerular filtration? You did not answer this question. Correct answer: A decreased efferent arteriole radius will increase the rate of glomerular filtration. 2 If all other variables are kept constant, how does blood pressure affect the rate of glomerular filtration? You did not answer this question. Correct answer: Blood pressure directly affects glomerular filtration rate. 3 In the absence of other renal processes (including tubular reabsorption and secretion), more glomerular filtration leads to a larger urine volume. You did not answer this question. Correct answer: true. 4

3/27/24, 11:01 PM PhysioEx Exercise 9 Activity 3 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex9/act3/ 2/4 Stop & Think Questions Experiment Data Afferent Radius (mm) Efferent Radius (mm) Beaker Press. (mm Hg) Glomerular Press. (mm Hg) Glom. Filt. Rate (ml/min) Urine Volume (ml) 0.50 0.45 90 55.08 124.99 200.44 0.50 0.45 70 49.72 58.57 161.76 0.60 0.45 70 54.25 114.72 196.72 0.50 0.35 70 51.24 77.41 231.12 0.60 0.35 70 55.58 131.15 245.57 Post-lab Quiz Results Predict Question: What will happen to the glomerular capillary pressure rate and glomerular filtration rate if both of these arteriole radii changes are implemented simultaneously with the low blood pressure condition? You did not answer this question. 1 If blood pressure were to drop (for example, as the result of blood loss), what changes in the nephron would allow the kidney to maintain its normal glomerular filtration rate? You did not answer this question. Correct answer: afferent arteriole dilation and efferent arteriole constriction. 1 Comparing the glomerular filtration rate and glomerular capillary pressure with the baseline values (from the first run), how effective was the increased afferent arteriole radius in compensating for the low blood pressure? You did not answer this question. Correct answer: The afferent arteriole dilation returned the low glomerular capillary pressure and filtration rate almost to baseline values. 2 Comparing the glomerular filtration rate and glomerular capillary pressure with the baseline values (from the first run), how effective was the decreased efferent arteriole radius in compensating for the low blood pressure? You did not answer this question. Correct answer: The efferent arteriole constriction improved the low glomerular capillary pressure and filtration rate marginally. 3

3/27/24, 11:01 PM PhysioEx Exercise 9 Activity 3 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex9/act3/ 4/4 Which arteriole radius adjustment was more effective at compensating for the effect of low blood pressure on the glomerular filtration rate? Explain why you think this difference occurs. You did not answer this question. 4 In the body, how does a nephron maintain a near-constant glomerular filtration rate despite a constantly fluctuating blood pressure? You did not answer this question. 5