Asthma may be attributed to:

  • A
    allergic reaction of the mast cells in the lungs
  • B
    accumulation of fluid in the lungs
  • C
    bacterial infection of the lungs
  • D
    inflammation of the bronchi and bronchioles

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Carbon monoxide $(CO)$ is harmful to humans because:

Excessive smoking leads to an increase in the concentration of which substance in the blood?

In which disease does fluid accumulate in the alveoli and bronchioles?

The state during which the respiratory centre is inhibited is termed as:

Which of the following organs is most affected by a deficiency of $O_2$ in humans?

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