Final answer:
A tubercle is a small round lesion that forms in the lungs as a result of tuberculosis infection. They are walled off areas where the infection is contained. Tubercles can spread to other organs through the bloodstream, causing miliary tuberculosis.
Step-by-step explanation:
A tubercle is a small round lesion that forms in the lungs as a result of tuberculosis infection. It is a walled off area where the infection is contained. Tubercles can eventually rupture, leading to a chronic, bloody cough. They can also spread to other organs through the bloodstream, causing miliary tuberculosis.