Multiple choice

Which of the following is the cause of asthma?

  1. Infection of trachea

  2. Infection of lungs

  3. Bleeding of pleural cavity

  4. Blockage of arteries

  5. Spasm in bronchial muscles

Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Asthma is caused due to allergic reaction of foreign substances that affects the respiratory tract. It can cause contraction spasm in bronchiolar smooth muscles.