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1. Which of the following structures in the respiratory system is responsible for gas exchange in the lungs? A) Alveoli B) Bronchi C) Trachea D) Pharynx Answer: A) Alveoli Rationale: The alveoli are tiny air sacs in the lungs where gas exchange occurs, allowing for the transfer of oxygen and carbon dioxide between the lungs and blood. 2. Which of the following is responsible for the production of red blood cells in the human body? A) Liver B) Kidneys C) Spleen D) Bone M
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