Arrange the following structures in the order air passes through them during inhalation:
1: alveolar ducts
2: alveolus
3: respiratory bronchiole
4: terminal bronchiole
a. 1, 2, 3, 4b. 2, 1, 3, 4c. 4, 3, 1, 2
d. 3, 2, 1, 4
e. 4, 3, 2, 1

Most carbon dioxide is transported in the blood
a. in the form of bicarbonate ions.
b. bound to carbamino compounds.
c. dissolved in the plasma.
d. by the leukocytes.
e. in the form of carbonic acid.

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