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1 Hormone. 2  can be either hydrophilic (polypeptide hormone) or lipophilic (steroid) biogenic amines can be either. 3  binds specific receptor on cell surface (hydrophilic hormones) or inside cell (lipophilic hormones). 4  lipophilic hormones bind carrier proteins to travel in circulation; hydrophilic hormones travel freely.efinitions. 1  Hormone. 2  can be either hydrophilic (polypeptide hormone) or lipophilic (steroid) biogenic amines can be either. 3  binds specific receptor on cell surface (hydrophilic hormones) or inside cell (lipophilic hormones).
Many hormones are steroids. Steroids are a class of lipids. All steroids share a carbon skeleton composed of four fused rings. Hormones are compounds used for long distance signaling in both plants and animals. In animals, specialized cells produce hormones and release them into the circulatory system. Hormones travel to target cells in other parts of the body and cause a variety of changes in the target areas. Changes caused by hormones include changes in gene expression in target cells as well as Steroid hormones are soluble in lipids and can easily pass through cellular and nuclear membranes.