Which of the following is a part of the thoracic cavity?

The thoracic cavity is a vital part of the human body, housing several crucial organs. Among these organs, the heart and lungs are primary components situated within the thoracic cavity, which is enclosed by the rib cage and the diaphragm. The heart, responsible for circulating blood throughout the body, and the lungs, essential for gas exchange, are both protected by this cavity, which provides a space for them to function optimally.

In contrast, the brain resides in the cranial cavity, separate from the thoracic cavity, while the stomach is located in the abdominal cavity, not the thoracic cavity. The diaphragm, although critical for respiration and sits below the thoracic cavity, is not considered an organ contained within it. Therefore, heart and lungs together represent the correct association with the thoracic cavity.