Final answer:
Pneumonia is a disease in which the alveoli of the lungs become inflamed and filled with fluid, inhibiting normal gas exchange with the blood.
Step-by-step explanation:
Pneumonia is a disease in which the alveoli of the lungs become inflamed and filled with fluid, inhibiting normal gas exchange with the blood. It is a common inflammatory disease of the respiratory tract caused by viral or bacterial infections.
Symptoms of pneumonia include coughing, chest pain, difficulty breathing, and fever.