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ID: 167699 • Letter: O
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1. Which of the following best defines saturation?
a. the nephron does not contain the correct transport proteins to transport a substrate.
b. the amount of substrate able to be transported is depleted.
c. the maximum rate of transport is achieved when all carriers are occupied by a substrate
2. Which of the following explains how excretion can be more than filtration?
The substrate is reabsorbed at the same rate it is secreted.
b. The substrate is secreted but not reabsorbed.
c. This is not possible.
3. What are some of the responses of the body when elevated blood pressure is sensed? [select all that apply]
a.excrete salts
b.excrete water
c.vasoconstriction
d.increase thirst
4. Which of the following hormone mechanisms increases ion AND water retention? [select all that apply]
(your selection must be able to stimulate both effects simultaneously)
a.Natriuretic peptides
b.Vasopressin
c.Aldosterone
d.Renin-angiotensin system
5. What are some of the homeostatic responses of severe dehydration? [select all that apply]
a.increase GFR
b.release vasopressin
c.activate renin
d.increase aldosterone
e.decrease Na+ reabsorbsiont
f.increase parasympathetic output
1. Which of the following best defines saturation?
a. the nephron does not contain the correct transport proteins to transport a substrate.
b. the amount of substrate able to be transported is depleted.
c. the maximum rate of transport is achieved when all carriers are occupied by a substrate
Explanation / Answer
1). c. the maximum rate of transport is achieved when all carriers are occupied by a substrate
The maximum rate of transport is achieved only if all the carriers are occupied, means saturation achieved. Beyond this point, the rate of transport does not increase with increase in substrate concentration.
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