NEET JEE CBSE CLASS 10 11 12
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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.
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𝗟𝗨𝗡𝗚𝗦 🫁
● Lungs are situated in the thoracic chamber which is anatomically an air-tight chamber.
● The thoracic chamber is formed dorsally by the vertebral column,ventrally by the sternum, laterally by the ribs and on the lower side by the dome-shaped diaphragm.
● The anatomical setup of lungs in thorax is such that any change in the volume of the thoracic cavity will be reflected in the lung (pulmonary) cavity.
● Such an arrangement is essential for breathing,as we cant directly alter the pulmonary volume
● Lungs are covered by a double layered pleura with pleural fluid between them.It reduces friction on the lung-surface.
● Outer pleural membrane is in close contact with the thoracic lining Inner pleural membrane is in contact with the lung surface.
IMG_20240530_212744_272.jpg0.60 KB
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Repost from NEET JEE CBSE CLASS 10 11 12
Physics Chapter wise Practice Quiz
Class 11th + 12th + Neet + Jee preparation......
1) Units & Measurements.
2) Motion in a straight line.
3) Motion in Plane.
4) Kinematics.
5) Laws Of Motion.
6) Work Power Energy.
7) system of particle and rotation motion
8) Gravitation.
9) Mechanical Properties of Solids.
10) Mechanical Properties Of Fluids.
11) Thermals Properties Of Matter.
12) Thermodynamics.
13) kinetic Theory Of Gases.
14) Oscillation.
15) Waves.
16) Electric Charges & Fields.
17) Electrical Potential & Capacitance
18) Current Electricity
19) Electromagnetic Waves
20) Ray Optics
21) Waves Optics
22) Dual Nature And Radiations
23) ATOMS
24) NUCLEI
25) Semiconductor[
Physics Complete New Syllabus Practice Quiz Chapter Wise.
Post link -
https://t.me/NEET_IIT_JEE_CBSE_CLASS_12_NOTES/5961
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Repost from Class 11 12 Science Notes
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