1. Which structure is responsible for the exchange of gases in the respiratory system? A) Trachea B) Alveoli C) Bronchi D) Diaphragm Answer: B) Alveoli Rationale: Alveoli are the tiny sacs within the lungs where the exchange of oxygen and carbon dioxide occurs, which is essential for respiration. 2. The cardiac cycle includes which of the following phases? A) Systole and Diastole B) Inhalation and Exhalation C) Proliferation and Differentiation D) Ossification and Resorption Answer: A) Systole and Diastole Rationale: The cardiac cycle consists of two main phases: systole

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