Final answer:
The three respiratory diseases discussed are asthma, triggered by allergens or stress; pneumonia, caused by infections leading to fluid-filled alveoli; and COPD, mostly caused by long-term exposure to smoke. John's symptoms suggest he may have pneumonia. Pneumonia is the disease described by alveoli filled with fluid.
Step-by-step explanation:
Respiratory System Diseases
Three common diseases of the respiratory system include asthma, pneumonia, and chronic obstructive pulmonary disease (COPD). Asthma is characterized by inflammation and constriction of the airways, and is often triggered by allergens, exercise, or stress. Pneumonia involves the inflammation of the alveoli, which fill with fluid or pus, typically caused by an infection. COPD, including emphysema and chronic bronchitis, leads to obstructed airflow from the lungs, and is usually due to long-term exposure to irritating gases or particulate matter, most often from cigarette smoke.
Clinical Focus on John
Regarding the clinical focus scenario, John experiences symptoms like headache, chest pain, coughing, shortness of breath, fever, nausea, and diarrhea. These symptoms may indicate an underlying respiratory infection such as pneumonia, especially since alveoli filled with fluid is a key characteristic of this condition. People with asthma and diabetes like John can be at a higher risk of developing severe infections due to potentially compromised immune systems.
Disease Identification
From the given list of diseases, the one that best fits the description of alveoli becoming inflamed and filling with fluid is pneumonia.