In order for the organs and organ systems to work together in a coordinated manner, they must communicate with each other. This communication works via the nervous system through electronic stimuli and the endocrine system through chemical signals.
Hormones work by being transported from the site of their formation to the site of their action via the blood vessel system. Very small amounts of a hormone are sufficient to trigger reactions in the target organ addressed. Hormones are not species-specific, i.e. hormones from higher animals can also have an effect on other animals and humans. Therefore, hormones such as B. estrogens that get into the environment cause significant problems.
The endocrine system is also known as the endocrine system, meaning a system that "secretes inward." That is why endocrine glands are also referred to as endocrine glands, since they secrete their secretions (hormones) inside the body. The release of hormones from the glands is either event-controlled or intermittent in regular rhythms. These can take place in minutes (insulin), hours (hormones of the gonads), months (menstrual cycle) or seasonal sections (sex hormones). Hormone glands belong partly to the nervous system, partly to the digestive system and partly to the peritoneum. Hormones influence, among other things, growth, metabolism, reproduction, psyche and behavior. There is a whole range of plants that contain hormone-like substances, these are called phytohormones. Other plant active ingredients can support the production of hormones, modulate hormone production or even inhibit it.