Question

What do you mean by a disease system explain giving two example

Answer 1

When the functioning or the appearance of one or more systems of the body will change for the worse, it gives certain abnormal signs of the disease. These visual changes in human beings are called symptoms. Symptoms give indication of the presence of a particular disease.  

Example (i) Lesions on the skin are the symptoms of chickenpox.  

Example (ii) Cough is the symptom of lung infection.