Mechanism of Ventilation (Breathing) | Inspiration & Expiration | Class 12 Biology FBISE 2026

Welcome to Yousuf Biology Academy! 🌿🫁 In Lecture 03 of Chapter 03 – Respiration, we discuss the Mechanism of Ventilation (Breathing) in humans with a clear, concept-based explanation according to the new FBISE Class 12 Biology Syllabus 2026. 📚 Topics Covered: 🔹 Mechanism of Ventilation 🔹 Inspiration (Inhalation) 🔹 Expiration (Exhalation) 🔹 Role of Diaphragm 🔹 External & Internal Intercostal Muscles 🔹 Movement of Rib Cage 🔹 Changes in Thoracic Cavity Volume 🔹 Changes in Lung Pressure 🔹 Movement of Air During Breathing 🔹 Comparison of Inspiration & Expiration 🔹 Important Board Exam Concepts & MCQs 🎯 Concept-Based | Board Exam Focused | Easy Explanation 📌 Class: 12th Biology 📌 Chapter: 03 – Respiration 📌 Lecture: 03 📌 Board: FBISE 📌 Syllabus: 2026 Subscribe to Yousuf Biology Academy for complete Class 12 Biology lectures, conceptual explanations, important MCQs, and board exam preparation. #Class12Biology #FBISE2026 #Respiration #MechanismOfVentilation #Inspiration #Expiration #Biology #YousufBiologyAcademy #FBISE #BiologyLecture