how do target cells recognize hormone?
 Hormones are produced by endocrine glands. In humans and many other animals, hormones are either peptide hormones or steroid and steroid-like hormones. The endocrine glands are ductless glands and secrete hormones directly into the blood vessels nearby. The hormones are then carried throughout the body and act upon target cells and tissues. The target cells have protein receptors which recognize the hormone and bind it. 