Which of the following is a secondary function of the thoracic cavity?

The thoracic cavity serves several important functions, with the primary role being the housing and protection of vital organs such as the heart and lungs. The structure of the thoracic cavity, which includes the rib cage and the sternum, effectively shields the heart from physical trauma while also allowing the organs within to function properly. Although the protection of the heart is considered a primary function, it is also part of the broader range of secondary functions associated with the thoracic cavity.

In contrast, the other options relate to bodily functions that are not performed by the thoracic cavity. Absorption of nutrients typically occurs in the digestive system, the production of hormones is primarily the function of the endocrine system, and detoxification is largely associated with the liver and kidneys. None of these processes happen within the thoracic cavity, reinforcing the idea that its secondary function predominantly relates to the protection of critical organs such as the heart.