Which of the following systems does NOT excrete waste from the body?

The endocrine system is primarily responsible for regulating various bodily functions through the secretion of hormones. Its main role is to maintain homeostasis, control growth and development, manage metabolism, and ensure the body responds to stress among other tasks. While hormone regulation can lead to waste products, the endocrine system itself does not directly excrete waste from the body in a manner similar to the other systems.

In contrast, the respiratory system excretes carbon dioxide, the byproduct of cellular respiration, through the process of breathing. Similarly, the digestive system eliminates waste products, such as undigested food and other materials, through the intestines. The urinary system is responsible for filtering blood and excreting waste products and excess substances in the form of urine. Each of these systems plays a critical role in removing waste to maintain the body's overall health, which is why the correct answer is the endocrine system, as it does not perform this specific function.