Final answer:
The condition where an entire lobe of the lungs is affected by bacteria in the alveoli is called pneumonia. It leads to fluid-filled alveoli, reduced gas exchange, and is typically treated with antibiotics.
Step-by-step explanation:
When an entire lobe of the lungs is affected by bacteria in the alveoli, the condition is called pneumonia. Pneumonia is an inflammatory disease where the alveoli fill with fluid, inhibiting proper gas exchange. This can lead to symptoms such as coughing, chest pain, difficulty breathing, and fever. The condition is often caused by viral or bacterial infections and is treated with antibiotics if it is bacterial in nature.