Chemical Coordination | Endocrine and Exocrine Glands |

It is the type of coordination present between the cells or different organs within the body of multicellular organisms. In this kind of coordination a group of cells releases specific chemicals, which regulates the activities of other cell of the body.
Endocrine glands are the glands that secrete hormones without ducts, while exocrine glands secrete hormones through ducts. ... Secretory products released directly into the bloodstream, eventually reaching the target organ. Secretory products are released to an internal organ or the external surface through a duct.
There are three basic types of hormones: lipid-derived, amino acid-derived, and peptide. Lipid-derived hormones are structurally similar to cholesterol and include steroid hormones such as estradiol and testosterone.
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