Asthma is characterized by?

Asthma is characterized by?
A. fibrosis of the alveoli.
B. intermittent airflow obstruction.
C. chronic dilatation of the airways.
D. chronic narrowing of the airways.


give the reason also!!!!

Answer by James
The answer is B:

A: NO. Asthma has nothing to do with alveoli. This answer is refering to the disease pulmonary fibrosis.

B: YES. This is asthma. Constriction of the airways, yet not chroniclly.

C: NO. Dilation means getting bigger, so that makes no sense

D: NO. This is close to asthma, but as I said, asthma isn't chronic. This is Chronic Obstructive Pulmonary Disease (COPD)

Answer by D.O.C.
B: intermittent airflow obstruction
Asthma by definition is hyperactive airways, resulting in episodic bronchospasm when triggered by certain stimuli
2 types of Asthma
1. Extrinsic : Allergic or Occupational
2. Intrinsic : could be precipitated by infections - viral most commonly, stress , exercise , cold temp. , drug ingestion eg. aspirin.

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