Which of the following functions is NOT associated with the immune system?

The function that is not associated with the immune system is the production of hormones. The immune system's primary roles include defending the body against pathogens, detecting foreign substances that may cause disease, and initiating immune responses to eliminate these threats.

When we look at the first function, while certain cells of the immune system can produce signaling molecules (like cytokines), the overall production of hormones is typically associated with the endocrine system, which regulates various bodily functions through hormones. In contrast, functions like defending against pathogens, detecting foreign substances, and initiating immune responses are integral parts of how the immune system operates, actively safeguarding the body’s health by identifying and responding to threats.