Excretory System Review
1. What two structures are found in a renal corpuscle?
2. What structural characteristic of glomeruli make them more permeable than normal capillaries?
3. Another name for the type of cells that make up the visceral layer of Bowman’s capsule is
4. The three processes necessary for formation of urine are
5. The part of the total cardiac output that passes through the kidneys is called the
and averages about % or ml/min.
6. The amount of plasma flowing through the kidneys per minute is equal to ml/min.
7. The amount of plasma filtered per minute is called the and
is equal to ml/min.
8. What components of blood are you NOT likely to see in a normal filtrate?
9. Name the three forces (pressures) at work during filtration.
10. Which of these is a filtering force? What creates this pressure?
11. Name those that are working against filtration and the factors that create them.
12. What effect would increasing blood colloid osmotic pressure have on filtration pressure?
13. What effect would increasing glomerular capillary pressure have on filtration pressure?
14. What effect would an increased capsular pressure have on filtration pressure?
15. If glomerular capillary pressure = 60 mm Hg, blood colloid osmotic pressure = 40 mm Hg, and
capsular pressure = 15 mm Hg, what would be the net filtration pressure (NFP)? . Is
this normal?
16. If the NFP is too high, what effect does this have on the GFR (increase or decrease-choose one)
17. And if the NFP is too low, what effect does this have on the GFR (increase or decrease?).
18. Therefore, according to your answers for #13 and 14, the relationship between NFP and GFR is
(directly or inversely) proportional?
19. What effect on GFR would vasodilation of afferent arterioles have? Vasoconstriction of
efferent arterioles? Vasoconstriction of efferent arterioles?
20. How would blood flow be affected during fight or flight and what mechanism would be responsible
for that response?
21. True or False: GFR changes continually with small changes in blood pressure.
22. The control of blood flow through the glomerulus is commonly referred to as
23. List all the membranes and areas that are crossed in tubular reabsorption of the filtrate.
24. What electrolyte (ion) is used most often in assisting in the reabsorption of other molecules?
a) Name at least two molecules that are transported in this manner.
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