The body of an animal consists of organs and organ systems. The regulation of their work is carried out using 2 systems – nervous and endocrine. The nervous system regulates itself through the transmission of nerve impulses. This instantly causes a response, but a new impulse is needed for a new excitation of the organ. The glands of the endocrine system produce biologically active substances, hormones, which enter the bloodstream. The action of hormones does not come so quickly, but it manifests itself over time.
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