Which system consists of glands that produce hormones?

The endocrine system is specifically responsible for the production and release of hormones, which are chemical messengers that regulate a variety of bodily functions, including metabolism, growth, and mood, among others. This system includes several glands such as the pituitary, thyroid, adrenal, and pancreas, each playing a crucial role in maintaining homeostasis and supporting the body's overall functionality through hormonal signals.

In contrast, other systems listed serve different primary functions. The cardiovascular system primarily circulates blood and oxygen throughout the body, the nervous system is responsible for transmitting nerve impulses and processing sensory information, while the muscular system facilitates movement through muscular contractions. Consequently, the unique role of the endocrine system in hormone production distinctly sets it apart from the other systems mentioned.