'Asthma' is caused by

  • A
    Infection of the trachea
  • B
    Infection of the lungs
  • C
    Bleeding into the pleural cavity
  • D
    Spasm in bronchial muscles

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Similar Questions

Which of the following is an occupational respiratory disorder?

Describe the disorders or deficiencies occurring due to disorders of the respiratory system.

Give scientific reason: $(1)$ Smoking is a cause of hypertension.

Emphysema is a chronic disorder caused by which of the following?

$A$: Asthmatic patients use bronchodilator drugs as well as inhalers for symptomatic relief.
$R$: Asthma is characterized by the spasm of smooth muscles in the wall of bronchioles due to allergens.

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