What is the endocrine system primarily responsible for?

The endocrine system is primarily responsible for chemical communication via hormones. This system consists of glands that release hormones directly into the bloodstream, allowing these chemical messengers to travel throughout the body and regulate various physiological processes. Hormones play critical roles in controlling metabolism, growth and development, tissue function, sleep, mood, and sexual function.

In contrast, regulating the speed of muscular movements is not a function of the endocrine system but rather relates to the nervous system and its control over muscular activity. Producing visual and auditory signals pertains to sensory systems and is not related to the functions of the endocrine system. Processing sensory input and motor output is a role of the nervous system, which involves the brain and spinal cord in interpreting signals and coordinating responses, rather than the hormone-based communication that the endocrine system provides.