pt 1. In gas exchange, carbon dioxide and oxygen move in and out of the alveoli through {Diffusion- ANSWER, Facilitated diffusion or through Active transport}

pt 2. Which of the following is true about this process?

A) Gas exchange stimulated the production of ATP.

B) Carbon dioxide is largely carried by the macrophages.

C)Oxygen typically gets trapped in the alveoli.

D) There is no expenditure of energy. -ANSWER