What is the endocrine system? What are the organs that belong to the endocrine system?

The endocrine system is a system of glands and organs that secrete hormones directly into the bloodstream to regulate bodily functions. Hormones are chemical messengers that travel throughout the body and affect target cells, tissues, and organs. Some of the organs that belong to the endocrine system include the pituitary gland, thyroid gland, adrenal gland, pancreas, ovaries, and testes. These organs secrete hormones such as growth hormone, thyroid hormone, adrenaline, insulin, estrogen, and testosterone, which play important roles in regulating metabolism, growth and development, immune function, and reproduction. The endocrine system works closely with the nervous system to maintain homeostasis and respond to stressors and changes in the environment.