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Presentation On Breathing And Exchange Of Gases - 4

Home > PowerPoint Slides > Presentation On Breathing And Exchange Of Gases - 4
Published in: Biology | NEET | Zoology
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This is the 2nd part of breathing and exchange of gases these notes will help you a lots for their entrance exam and board exam.

Akanksha / Outside India

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Qualification: BDS (Himachal Dental College , Mandi - 2022)

Teaches: Anatomy, Bio Technology, Biology, Botany, Zoology, AIIMS, AIPMT, BDS, NEET

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  1. BREATHING AND EXCHANGE OF GASES BY AKANKSHA
  2. TRANSPORT OF GASES ' Blood is the medium of transport for 02 and C02. 97 per cent of 02 is transported by RBCs in the blood. Remaining 3 per cent of 02 is carried in a dissolved state through the plasma. Akanksha Nearly 20-25 per cent of C02 is transported by RBCs whereas 70 per cent of it is carried as bicarbonate. About 7 per cent of C02 is carried in a dissolved state through plasma.
  3. TRANSPORT OF OXYGEN Haemoglobin is a red coloured iron containing pigment present in the RBCs. 02 can bind with haemoglobin in a reversible manner to form oxyhaemoglobin. Akanksha Each haemoglobin molecule can carry a maximum of four molecules of 02. Binding of oxygen with haemoglobin is primarily related to partial pressure of 02. A sigmoid curve is obtained when percentage saturation of haemoglobin with 02 is plotted against the p02. This curve is called the Oxygen dissociation curve 100 80 60 40 20 o 20 40 60 80 100 Partial pressure of oxygen (mm Hg)
  4. CONTINUEm.. ' In the alveoli, where there is high p02, low pC02, lesser H+ concentration and lower temperature, the factors are all favourable for the formation of oxyhaemoglobin. ' In the tissues, where low p02, high pC02, high H+ concentration and higher temperature exist, the conditions are favourable for dissociation of oxygen from the oxyhaemoglobin. Akanksha Clearly indicates that 02 gets bound to haemoglobin in the lung surface and gets dissociated at the tissues. Every 100 ml of oxygenated blood can deliver around 5 ml of 02 to the tissues under normal physiological conditions.
  5. TRANSPORT OF CARBON D10KlDE C02 is carried by haemoglobin as carbamino-haemoglobin. Akanksha ' IN the tissues, more binding of carbon dioxide occurs when the pC02 is high and p02 is low . ' In the alveoli, when the pC02 is low and p02 is high the C02 from carbamino-haemoglobin takes place, i.e., C02 which is bound to haemoglobin from the tissues is delivered at the alveoli. At the tissue site where partial pressure of C02 is high due to catabolism, C02 diffuses into blood and forms HC03 — and H+,. At the alveolar site where pC02 is low, the reaction proceeds in the opposite direction leading to the formation of C02 and H20. C02 trapped as bicarbonate at the tissue level and transported to the alveoli is released out as C02 Every 100 ml of deoxygenated blood delivers approximately 4 ml of C02 to the alveoli.
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