ASTHMA -In an Asthma attack ,there is an inflammation in the tract which constrict the air passage .The inflammation produces thick mucus , which makes it difficult for the patient to breathe .While the tract is partially blocked by the swelling ,very little air is inhaled because of the mucus congestion. This inevitably leads to deficiency of oxygen intake and consequently to breathlessness .In such a situation , the patient has to take -usually by inhaling medicines that can relax and clear the br...