### 8. Key Definitions
- Tidal Volume: Air inhaled/exhaled at rest (~500 mL).
- Vital Capacity: Maximum air volume lungs can hold.
- Alveoli: Microscopic air sacs for gas exchange.
- Diaphragm: Dome-shaped muscle below lungs.
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Summary: The respiratory system ensures O₂ supply and CO₂ removal via specialized structures (e.g., alveoli) and coordinated muscle movements. Factors like exercise, smoking, and environment impact breathing efficiency, necessitating hygiene practices to maintain health.
- Tidal Volume: Air inhaled/exhaled at rest (~500 mL).
- Vital Capacity: Maximum air volume lungs can hold.
- Alveoli: Microscopic air sacs for gas exchange.
- Diaphragm: Dome-shaped muscle below lungs.
---
Summary: The respiratory system ensures O₂ supply and CO₂ removal via specialized structures (e.g., alveoli) and coordinated muscle movements. Factors like exercise, smoking, and environment impact breathing efficiency, necessitating hygiene practices to maintain health.