| The Respiratory System |
| Non Respiratory Functions |
| Temperature Control |
📘 What is the Respiratory System?
The respiratory system is the biological system responsible for the intake of oxygen and the removal of carbon dioxidefrom the body. It enables cellular respiration, which is essential for producing energy in the form of ATP.
🫁 Major Organs of the Human Respiratory System:
| Organ | Function |
| Nose/Nasal cavity | Filters, warms, and moistens the air |
| Pharynx | Common pathway for air and food |
| Larynx (Voice Box) | Produces sound and connects pharynx to trachea |
| Trachea (Windpipe) | Air passage to lungs; lined with cilia and mucus |
| Bronchi | Two tubes that branch from trachea into each lung |
| Bronchioles | Smaller branches inside the lungs |
| Alveoli | Tiny air sacs where gas exchange occurs |
| Lungs | Main organs where oxygen is absorbed and CO₂ is released |
| Diaphragm | Dome-shaped muscle aiding in breathing |
🔄 Breathing Process:
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Inhalation – Diaphragm contracts, lungs expand, air enters.
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Gas Exchange – Oxygen diffuses into the blood from alveoli; CO₂ diffuses out.
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Exhalation – Diaphragm relaxes, lungs deflate, air is expelled.
✅ 5 Key Points on the Respiratory System:
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The respiratory system provides oxygen to the body and removes carbon dioxide.
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Gas exchange occurs in alveoli, where blood absorbs O₂ and releases CO₂.
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The diaphragm and intercostal muscles control the expansion and contraction of lungs.
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Respiratory health is affected by conditions like asthma, bronchitis, and smoking.
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Cellular respiration (in mitochondria) uses oxygen from the lungs to generate energy (ATP).
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