7. How has the avian lung adapted to the metabolic demands of flight? (A) Airflow through the avian lung is bidirectional like in mammals. (B) There is more dead space within the avian lung so that oxygen can be stored for future use. (C) Countercurrent circulation is present in the avian lung. (D) Gas exchange occurs during both inhalation and exhalation.

8. The loop of Henle dips into the renal cortex. This is an important feature of osmoregulation in terrestrial vertebrates because _______. (A) absorptive processes taking place in the loop of Henle are hormonally regulated (B) differential permeabilities of ascending and descending limbs of the loop of Henle are important in establishing an osmotic gradient (C) the loop of Henle plays an important role in detoxification (D) additional filtration takes place along the loop of Henle

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