When the blood contains a high percentage of $CO_2$ and a very low percentage of $O_2$,the breathing stops and the person becomes unconscious. This condition is known as:

  • A
    suffocation
  • B
    asphyxia
  • C
    emphysema
  • D
    eupnea

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Hypoxia is a condition in which tissues receive insufficient oxygen. What is it caused by?

$A$ - Smoking is associated with increased incidence of cancer of lung.
$R$ - It increases $CO$ content in blood and reduces the concentration of haem-bound oxygen.

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