Complete Respiratory System | Breathing & Exchange of Gases | NCERT Class 11 Biology | NEET 2026

Описание: This lecture covers the Complete Human Respiratory System, explained strictly according to NCERT Class 11 Biology and fully aligned with the NEET 2026 syllabus.
The chapter Breathing and Exchange of Gases is one of the most conceptual and high-weightage chapters in Human Physiology. Every year, 2–3 direct MCQs are asked from:
Structure of respiratory organs
Mechanism of breathing
Exchange of gases
Transport of gases
Regulation of respiration
Respiratory disorders
This lecture is designed to give you:
Crystal-clear diagrams
NCERT-accurate explanations
Strong conceptual clarity
Fast revision format
Maximum scoring potential
If you master this lecture, you can easily score full marks from the Respiratory System in NEET.
🔬 Topics Covered in This Lecture (NCERT Order)
🔹 1. Introduction to Respiration
Meaning of respiration
Difference between:
Breathing
Cellular respiration
Types of respiration:
Aerobic
Anaerobic
📌 NEET Point:
Breathing is a physical process, respiration is chemical.
🔹 2. Human Respiratory Organs
Nose & nasal chamber
Pharynx
Larynx
Trachea
Bronchi
Bronchioles
Alveoli
Lungs
📌 NEET Favourite:
Alveoli increase surface area for gas exchange.
🔹 3. Mechanism of Breathing
✅ Inspiration
Diaphragm contracts
Thoracic volume increases
Air enters lungs
✅ Expiration
Diaphragm relaxes
Thoracic volume decreases
Air leaves lungs
📌 NEET Trap:
Expiration is passive during normal breathing.
🔹 4. Exchange of Gases
Occurs by diffusion
At:
Alveoli
Tissues
📌 NEET Favourite:
Oxygen diffuses from alveoli to blood.
🔹 5. Transport of Gases
🔸 Oxygen Transport
As oxyhaemoglobin (97%)
Dissolved in plasma (3%)
🔸 Carbon Dioxide Transport
As bicarbonate ions (70%)
Carbaminohaemoglobin (23%)
Dissolved (7%)
📌 NEET Repeated Question:
Most CO₂ is transported as bicarbonate.
🔹 6. Regulation of Respiration
Medullary respiratory center
Pneumotaxic center
Chemoreceptors
📌 NEET Favourite:
CO₂ is main regulator of respiration.
🔹 7. Respiratory Disorders
Asthma
Emphysema
Bronchitis
Pneumonia
Occupational lung diseases
📌 NEET Trap:
Emphysema damages alveolar walls.
📊 NCERT Summary Table (High-Yield)
Process
Main Site
Function
Breathing
Lungs
Gas intake
Exchange
Alveoli
Diffusion
O₂ Transport
RBC
Oxyhaemoglobin
CO₂ Transport
Plasma
Bicarbonate
Regulation
Medulla
Control
⚠️ NEET Traps Covered
✔ Expiration is passive
✔ CO₂ main regulator
✔ Alveoli = exchange site
✔ Bicarbonate = major CO₂ form
✔ Emphysema = alveoli damage
🎓 Who Should Watch This Lecture?
NEET 2026 & 2027 aspirants
Class 11 Biology students
Droppers revising NCERT
Foundation batches
Biology teachers
Respiratory System NEET
Breathing and Exchange of Gases
Human Respiration
Alveoli Function
Oxygen Transport
Carbon Dioxide Transport
NCERT Respiratory System
NEET 2026 Biology
Class 11 Respiration
Lung Function
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