Gangrene is a serious condition that occurs when a part of the body's tissue dies due to a lack of blood supply. It is often caused by infections or injury, and can lead to amputation if not treated promptly.
In the film, Harry's arm becomes gangrenous due to a combination of factors:
* Drug use: Harry's addiction to heroin severely constricts his blood vessels, reducing blood flow to his extremities.
* Injection practices: Repeated injections into the same vein can damage the blood vessels and increase the risk of infection.
* Poor hygiene: Harry's neglect of his physical health and lack of hygiene increase the risk of infection.
The film depicts the devastating effects of drug addiction and its impact on the human body in a graphic and disturbing way, highlighting the importance of seeking help and avoiding substance abuse.