Respiratory system and its function part 2

*📚 12th Class Biology | Respiratory System: Parts & Functions | FSc 2nd Year* Complete lecture on *Human Respiratory System* for BISE Federal, KPK, Punjab Boards. In this video we explain all parts of the respiratory tract + their functions with easy diagrams. Perfect for board exams & MDCAT 2026. *✅ Topics Covered:* 1. *Nose & Nasal Cavity* – Filtration, warming, moistening of air 2. *Pharynx & Larynx* – Passageway + Voice box function 3. *Trachea* – C-shaped rings, cilia & mucus role 4. *Bronchi & Bronchioles* – Conduction of air to lungs 5. *Alveoli* – Site of gaseous exchange, 300+ million alveoli 6. *Lungs & Pleura* – Structure & protection 7. *Diaphragm* – Breathing mechanism, inspiration vs expiration *#12thClassBiology #RespiratorySystem #FScBiology #BISEAbbottabad #KPKBoard #FederalBoard #MDCAT2026 #BiologyChapter1 #HumanLungs #Alveoli*