When a man inhales air containing a normal concentration of ${O_2}$ as well as $CO$,he suffers from suffocation because:

  • A
    $CO$ reacts with ${O_2}$ reducing its percentage in air.
  • B
    Haemoglobin combines with $CO$ instead of ${O_2}$ and the product cannot dissociate.
  • C
    $CO$ affects the diaphragm and intercostal muscles.
  • D
    $CO$ affects the nerves of the lungs.

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When the affinity of $O_2$ and $CO_2$ for haemoglobin is compared,it is:

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If ${O_2}$ concentration in tissue was almost as high as at the respiratory surface,what would happen?

The oxygen dissociation curve of haemoglobin is:

Although much carbon dioxide is carried in blood,yet blood does not become acidic because

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