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The endocrine system helps to regulate the body and control other systems in the body. The endocrine system controls the body by sending out chemical messengers. These chemical messengers control changes that happen in the body over long periods of time. Hormones are the chemical messengers of the endocrine system. Hormones are substances produced in one part of the body that cause changes in another part of the body. These changes help the body maintain homeostasis. Cells that make hormones are part of endocrine glands. These glands release or secrete hormones that travel through the blood. As a result, they come into contact with most cells of the body. Hormones, however, only affect certain cells. The cells that are affected by a hormone are called target cells. Target cells have specific receptor proteins that recognizer and bind to a specific hormone. They fit together like a lock and key.

Question: Write out the steps of how hormones are released and get to where they need to go (include vocab like hormone, gland, and target) (3 sentences)
Anothe question: Why do hormones only effect certain cells?