**Text:**"A person with asthma may have a healthy VC, but a reduced FEV₁. Explain how this can be."**Explanation for Educational Website:**In this context, "VC" stands for Vital Capacity and "FEV₁" stands for Forced Expiratory Volume in one second. - **Vital Capacity (VC)** is the maximum amount of air a person can exhale after a maximal inhalation. A healthy VC indicates that the total lung capacity is normal.- **Forced Expiratory Volume in one second (FEV₁)** measures how much air a person can forcefully exhale in the first second of a breath.In asthma, airway obstruction can make it difficult to exhale air quickly, which can result in a reduced FEV₁ despite having a full lung capacity and normal VC. Airways become narrower due to inflammation and mucus, hindering airflow particularly during exhalation. This is why a person with asthma might display a normal VC but a lower FEV₁.

Asthma is a condition that causes your air pass pathway to narrow and swell, as well as create excess mucus that reduces the total capacity of air in the lungs. It is a common non-communicable disease that affects children and adults alike. There is the creation of inflammation in the airpassage of the lungs. asthma is caused by some allergens, air pollution, dust, chemicals.Obstructive lung disease means patients have short breaths because they can not exhale and carry out all the air from the lungs and a small volume of air remain inside the lungs. This occurs due to the damages in the lungs and air pass pathway becomes thick and narrow. and in restrictive type, means air into the lungs can not fill fully. Asthma comes under obstructive lung diseases. Vital capacity(VC)- after forceful expiration, the maximum volume of air can breathe, is called vital capacity. Vital capacity depends on age, gender, height and weight of the person to person. In asthma, there is only slightly reduced VC, and doesn't affect the test results in normal asthma. VC is affected by severe asthma. Forced expiratory volume(FEV1)-in one second, the maximum volume of air exhaled by the lungs is called FEV1 and helps in the detection of the severity of asthma's airway obstruction. It is calculated in percentage value taken from the spirometer(an instrument that detects the volume of air in breathing) reading if results more than 80% means having normal if it decreased to this value that means there is obstruction into the airways of the lungs.So, a healthy asthma person has normal VC because it doesn't too much affect by disease and all test shows it is normal at normal asthma, if there is severe asthma then it decreases, and reduced FEV1 value comes because asthma is an obstructive type of disease and affect ERV1 by lowering the values than normal value.