Which of the following would you expect to increase filtration rate? (select all

Question

Which of the following would you expect to increase filtration rate? (select all that apply)

a. MAP increases from 110 mm Hg to 170 mm Hg.

b.afferent arterial dilates

c.afferent arterial constricts

d.efferent arterial dilates

e.efferent arterial contracts

f.macula densa cells sense an increase in NaCl delivery

g.macula densa cells sense a decrease in NaCl delivery

Which of the following are ways in which reabsorption is facilitated? (select all that apply)

secondary active transport

active transport

passive reabsorbtion

diffusion

endocytosis

Which of the following is the driving force behind glucose transport from the proximal tubule cells to the interstitial fluid?

an ATP driven active transporter

the concentration gradient of K+

the concentration gradient of glucose

Which of the following explains how excretion of a substrate can be more than the filtration of that substrate?

The substrate is reabsorbed at the same rate it is secreted.

The substrate is secreted but not reabsorbed.

There are high levels of reabsorption and low levels of secretion.

This is not possible.

The substrate is reabsorbed at the same rate it is secreted.

The substrate is secreted but not reabsorbed.

There are high levels of reabsorption and low levels of secretion.

This is not possible.

Explanation / Answer

1.Factors that increase filtration rate

b. afferent arterial constricts

e. efferent arterial contracts

2. ways in which reabsorption is facilitated

a. secondary active transport (sodium dependent glucose transport from PCT)

b. active transport (Eg., NaCl from PCT)

c. passive reabsorption (bicarbonate from PCT, water from descending LoH)

d. diffusion

3. driving force behind glucose transport from the proximal tubule cells to the interstitial fluid?

a. an ATP driven active transporter

4. how excretion of a substrate can be more than the filtration of that substrate?

b. The substrate is secreted but not reabsorbed. (Eg., organic acids are secreted increasing the filtration rate.

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