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AP Biology TV: Assignment 8
Excretion & Kidney Function
Directions: only attempt the following questions AFTER viewing the video lectures posted on
AP Biology TV. Unlike most other HW assignments, each of your responses will be graded.
1) Describe the difference(s) between egested waste & excretory wastes.
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2) Identify THREE excretory wastes & the cellular processes that produce them.
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3) Identify the main method by which excreted wastes are eliminated from the human body.
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4) Describe nitrogenous wastes in terms of the following:
a) From what compounds are they originally derived?
b) What metabolic reaction produces nitrogenous wastes?
c) Within what body tissue are nitrogenous wastes produced?
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5) Differentiate between ammonia, urea, & uric acid in terms of the following:
a) Relative toxicity
b) Relative structural complexity
c) Amount of water required for excretion
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6) Label the parts of the nephron in the diagram below
a)
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b)
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c)
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e)
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f)
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g)
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h)
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i)
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k)
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l)
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m)
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7) Which region / structure associated with the nephron functions in filtration of blood? What
substances generally do NOT get filtered from the blood & enter the nephron as filtrate?
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8) From which region / structure associated with the nephron are simple sugars & amino acids
likely reabsorbed back into the blood?
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9) From which region / structure associated with the nephron is ammonia selectively secreted
from the blood INTO the filtrate within the nephron? What purpose does the incorporation
of ammonia into the filtrate serve?
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10) What region of the nephron contributes to the establishment of the steep solute gradient
that exists from the renal cortex to the renal medulla? What effect does this have of the
ascending loop of Henle?
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11) Describe the chemical composition of urine once it is formed in the collecting duct? To
what part of the kidney do the collecting ducts of nephrons lead?
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12) Explain how drinking large amounts of fluid will affect the secretion of ADH? How will this
affect water reabsorption from the collecting duct?
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