Which body system is responsible for secreting hormones that regulate bodily functions?

The endocrine system is the primary body system responsible for secreting hormones that regulate a wide range of bodily functions. Hormones are chemical messengers produced by various glands within this system, such as the pituitary, thyroid, adrenal glands, and pancreas. These hormones travel through the bloodstream to target organs and tissues, influencing growth and development, metabolism, mood, immune function, and reproductive processes.

In contrast, while the digestive system plays a crucial role in processing food and extracting nutrients, it does not secrete hormones that primarily regulate bodily functions. The circulatory system is responsible for transporting hormones and other substances throughout the body but does not itself produce hormones. Lastly, the nervous system regulates bodily functions through electrical signals and neurotransmitters; it is not involved in hormone production. Therefore, the endocrine system is indeed the correct choice for the regulation of bodily functions through hormone secretion.