ANATOMY

Detailed explanation-1: -Most pneumonia occurs when a breakdown in your body’s natural defenses allows germs to invade and multiply within your lungs. To destroy the attacking organisms, white blood cells rapidly accumulate. Along with bacteria and fungi, they fill the air sacs within your lungs (alveoli).

Detailed explanation-2: -Pneumonia is an infection that affects one or both lungs. It causes the air sacs, or alveoli, of the lungs to fill up with fluid or pus. Bacteria, viruses, or fungi may cause pneumonia.

Detailed explanation-3: -Pneumonia is an infection of the lungs that may be caused by bacteria, viruses, or fungi. The infection causes the lungs’ air sacs (alveoli) to become inflamed and fill up with fluid or pus. That can make it hard for the oxygen you breathe in to get into your bloodstream.

Detailed explanation-4: -When the deep lungs are injured or infected, pus accumulates there. Pus in the alveoli is pneumonia. Pneumonia is caused by an infection, and a wide variety of microbes can infect the lungs. Most of the time, pneumonia is caused by viruses or bacteria, but fungi and other microbes can be responsible.