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SHORT NOTES #Handwritten ───────────────────── 🎖Targeted Exam : JEE & NEET🎖 ───────────────────── ⚜️ CLASS XI ● PHYSICS ⚜️ ⊙ Kinematics -1 ⊙ Kinematics -2 ⊙ Laws of Motion ⊙ Friction ⊙ Work, Power And Energy ⊙ Circular Motion ⊙ Rotational Dynamics ⊙ Gravitation ⊙ Elasticity And Surface Tension ⊙ Viscosity ⊙ Fluid ⊙ Heat ⊙ Mode of Heat Transfer ⊙ Thermodynamics ⊙ Kinetics Theory of Gases ⊙ Simple Harmonic Motion (SHM) ⊙ Waves ════════════════ ⚜️ CLASS XII ● PHYSICS ⚜️ ⊙ Electrostatics ⊙ Current Electricity ⊙ Capacitance ⊙ Electrical Measurement Device ⊙ Magnetism ⊙ Geo-Magnetic ⊙ Magnetic Property ⊙ Electromagnetic Induction ⊙ Alternating Current (AC) ⊙ Ray Optics ⊙ Wave Nature of Light ⊙ Modern Physics ──────────────── How to Open These Notes Links ? [ Share it with your needy friends ]

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Fig.: A diagram of a section of an alveolus with a pulmonary capillary 𝗘𝗫𝗖𝗛𝗔𝗡𝗚𝗘 𝗢𝗙 𝗚𝗔𝗦𝗘𝗦 Alveoli are the primary sites of exchange of gases. Gaseous Exchange in Lungs ● At alveoli level, gaseous exchange occur through respiratory membrane (diffusion membrane) which is 0.2 mm thick (total thickness is much less than a mm). ● 𝗜𝘁 𝗰𝗼𝗻𝘀𝗶𝘀𝘁 𝗼𝗳 𝘁𝗵𝗿𝗲𝗲 𝗹𝗮𝘆𝗲𝗿𝘀: (i) Alveolar epithelium (thin squamous epithelium) (ii) Basement substance in between them (composed of a thin basement membrane supporting the squamous epithelium and the basement membrane surrounding the single layer endothelial cells of capillaries) (iii) Endothelium of alveolar blood capillaries ● Exchange of gases also occur between blood and tissues. ● O2 and CO2 are exchanged in these sites by simple diffusion mainly based on pressure/concentration gradient ● Pressure contributed by an individual gas in a mixture of gases is called partial pressure and is represented as pO2 for oxygen and pCO2 for carbon dioxide. —————————————— For More Material Join 👇👇 Team Believer Official ✔️

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