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 |

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| 1. | 1200, 300 | 2. | 300, 1200 |
| 3. | 300, 600 | 4. | 600, 300 |

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What acts as a check on the renin-angiotensin mechanism?
| 1. | ANF | 2. | ADH |
| 3. | Aldosterone | 4. | Erythropoietin |

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