Bronchoconstriction of smooth muscles is witnessed by asthma patients . It is triggered due to release of ..X.. and treated by ....Y...

Options

A. X- histamine , Y-aldosterone
B. X- antihistamine Y - epinephrine
C. X- antihistamine Y - prednisolone
D. X- histamine , Y- adrenaline

Answer

To solve the question regarding bronchoconstriction in asthma patients, we can break it down into two parts: identifying the trigger (X) and the treatment (Y).

### Step-by-Step Solution:

1. **Understanding Bronchoconstriction**:
- Bronchoconstriction refers to the tightening of the smooth muscles surrounding the airways in the lungs. This can lead to difficulty in breathing, a common symptom in asthma patients.

**Hint**: Remember that bronchoconstriction affects airflow in the lungs.

2. **Identifying the Trigger (X)**:
- In asthma, bronchoconstriction is primarily triggered by the release of certain chemicals in the body. One of the key players in this process is **histamine**. Histamine is released during allergic reactions and can cause the smooth muscles in the airways to constrict.

**Hint**: Think about what substances are released during allergic reactions or asthma attacks.

3. **Identifying the Treatment (Y)**:
- The treatment for bronchoconstriction often involves the use of medications that can relax the smooth muscles and open the airways. One common treatment is **adrenaline (epinephrine)**, which acts as a bronchodilator. It helps to counteract the effects of histamine and relieve symptoms.

**Hint**: Consider medications that are commonly used in emergency situations for asthma attacks.

4. **Final Answer**:
- Therefore, the answer to the question is:
- X = Histamine
- Y = Adrenaline

### Summary:
- Bronchoconstriction in asthma patients is triggered by the release of **histamine** and is treated by **adrenaline**.