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Breathing and Exchange of Gases

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

What are the major transport mechanisms for CO2
? Explain.


Transportation of carbon dioxide : It is transported in three forms :

1. In solution form : About 7% CO2 dissolves in plasma and is transported as such.

(2) Through RBCs: About 20 – 25% of CO2 is transported by the red blood cells as  carbaminohaemoglobin. Carbon dioxide binds to the amino groups on the polypeptide chains of haemoglobin and forms a compound known as carbaminohaemoglobin.

(3) Through sodium bicarbonate: About 70% of carbon dioxide is transported as sodium bicarbonate. As CO2 diffuses into the blood plasma, a large part of it combines with water to form carbonic acid in the presence of the enzyme carbonic anhydrase. Carbonic anhydrase is a zinc enzyme that speeds up the formation of carbonic acid. This carbonic acid dissociates into bicarbonate (HCO3) and hydrogen ions (H+).
begin mathsize 16px style bold space bold space bold CO subscript bold 2 bold space bold plus bold space bold H subscript bold 2 bold O bold space bold rightwards harpoon over leftwards harpoon with bold Carbonic bold space bold space bold anhydrase bold space on top bold space bold H subscript bold 2 bold CO subscript bold 3 bold space bold rightwards harpoon over leftwards harpoon with bold Carbonic bold space bold space bold anhydrase bold space on top bold space bold HCO subscript bold 3 superscript bold minus bold space bold plus bold space bold H to the power of bold plus end style

 

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70% of carbondioxide is transported as ?

Bicarbonate
360 Views

By what amount the solubility of carbondioxide is more than the solubility of oxygen?

20 - 25 times
414 Views

Oxygen is carried by haemoglobin as?

Oxyhaemoglobin.
415 Views

What is the partial pressure of oxygen in  oxygenated blood ?

95 mm Hg
702 Views

Name the cavity having lungs.

Thoracic cavity.
448 Views