Reabsorption is the movement of solutes out of the tubules, through the interstitial fluid and into the capillaries. True False 2.

1.Reabsorption is the movement of solutes out of the tubules, through the interstitial fluid and into the capillaries.

True

False

 2.

Secretion is the movement of solutes out of the capillaries, through the interstitial fluid and into the nephron.

True

False

3.

Which of the following substances do NOT enter the glomerular capsule (Bowman's capsule) from the glomerulus during initial filtration? Choose all that apply.

Water

Blood cells

NaCl

Glucose

Individual amino acids

Proteins

4.

Creatinine and urea are described as _________________ in the initial filtrate.

wastes

nutrients

5.

The presence of ADH (anti diuretic hormone) helps the collecting duct _________________ water.

secrete

reabsorb

6.

The descending limb of the nephron loop (Loop of Henle) is impermeable to water and the ascending limb is impermeable to ions.  

True

False

7.

Reabsorption of water from the descending limb is a form of __________________ transport.  

passive

active

8.

The osmolarity of the interstitial fluid of the medulla is the most concentrated ____________.

near the cortex

deeper in the medulla

at the start of the medulla

There is no difference in concentration.

9.

The osmolarity of filtrate is most concentrated _________________.

when entering the nephron loop

at the bottom of the nephron loop

when exiting the loop and entering the distal convoluted tubule

10.

Challenge Question!

If the nephron loop in a different organism (like a kangaroo rat from the desert) was LONGER than the human nephron loop, the maximum medullary interstitial osmolarity would be ____________ compared to 1200 mOsm/L.  

greater than

less than

equal to