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Topic Notes · Easy summaries with diagrams
Chapter 2 — Chapter 2 — Human Respiratory System
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📘Easy summary
Breathing (ventilation): physical movements that take air into (inhalation) and out of (exhalation) the lungs. Gaseous exchange: diffusion of O₂ from alveoli into blood and CO₂ from blood into alveoli (and between blood and tissues). Cellular respiration: chemical breakdown of glucose (C–H bonds) inside cells, mainly mitochondria, to release energy (ATP).
⭐Key points
- Breathing is mechanical; respiration is biochemical.
🔬Diagram
🌿Real-life example
Rest: 12–20 breaths/min; exercise: up to 40–50.
💡Exam tip
- Don't confuse breathing with respiration.
✅Quick check
1. Breathing means:
2. Respiration occurs in:
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