The urine concentrating ability of mammals and birds is correlated with the length of their:

1. ureters 2. proximal convoluted tubules
3. distal convoluted tubules 4. loops of Henle
Subtopic:  Human Kidney: Functions | Concentration of Urine |
 83%
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The osmolarity of interstitial fluid in renal cortex of vertebrates is about _____ mOsm per litre, which can be increased to about _______ mOsm per litre in the inner medulla during concentration of urine by the kidneys.
1. 1200, 300 2. 300, 1200
3. 300, 600 4. 600, 300
Subtopic:  Concentration of Urine |
 93%
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What acts as a check on the renin-angiotensin mechanism?

1. ANF 2. ADH
3. Aldosterone 4. Erythropoietin
Subtopic:  Concentration of Urine |
 84%
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