Asthma is a respiratory disease caused by which of the following?

  • A
    Infection in the trachea
  • B
    Infection in the lungs
  • C
    Bleeding in the pleural cavity
  • D
    Inflammation of bronchi and bronchioles

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$CO$ (Carbon monoxide) is harmful because:

When the oxygen supply to the tissue is inadequate,the condition is known as:

Cyanosis refers to:

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