What device is used with a light attached to look inside a body cavity or organ?

The device that is used with a light to look inside a body cavity or organ is the endoscope. An endoscope is designed specifically for minimally invasive examination of internal structures and can be used for diagnostic or therapeutic purposes. It consists of a flexible tube with a light and a camera at the end, allowing visualization of organs and cavities without the need for major surgical procedures.

This makes it an essential tool in various medical and veterinary applications, enabling practitioners to assess conditions, perform biopsies, and even carry out certain treatments without invasive surgery. The endoscope can be inserted through natural openings in the body, such as the mouth or anus, or through small incisions, providing a less traumatic option for looking inside the body.

Other devices, like the cystoscope, laparoscope, and stethoscope, serve different purposes. A cystoscope is specifically designed for examining the bladder; a laparoscope is used for viewing the abdominal cavity; and a stethoscope is utilized for listening to internal body sounds, such as the heartbeat or breathing, rather than providing visual access to internal structures.