Question

The exchange of gases between the bloodstream and lungs takes place at ______________ through a process known as __________.

• A. trachea; diffusion
• B. alveoli; diffusion
• C. treachea; breathing
• D. alveoli; breathing

Answer 1

The correct option is B alveoli; diffusion

• Alveoli are tiny balloon shaped structures where the exchange of gases takes place between the blood and the air in the lungs.
• Carbon dioxide in the blood moves into the alveoli while oxygen moves into the blood.
• The process by which this exchange takes place is known as diffusion.