• Fred A. Kincl
Part of the Monographs on Endocrinology book series (ENDOCRINOLOGY, volume 31)


Two classes of regulatory substances, enzymes and hormones, control life processes in multicellular organisms. Chemical reactions, taking place in dilute aqueous solutions within the cell, that would normally proceed too slowly are catalyzed by enzymes. Enzyme activity is often induced by the other class of regulatory agents, the hormones. Hormones, produced by specific ductless organs (endocrine glands), diffuse into the blood and are distributed throughout the body. These regulatory agents may act on one specific tissue (target organ) or stimulate a variety of tissues. Hormones have a variety of chemical structures, from water soluble simple peptides (three amino acid residues) to complex glycoproteins (molecular weight in the range of 30,000 daltons) to lipids of low molecular weight (steroid hormones and prostanoids).


Pituitary Gland Gonadal Hormone Endocrine Gland Testosterone Propionate Female Rodent 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • Fred A. Kincl
    • 1
  1. 1.The College of Staten Island of the City University of New YorkStaten IslandUSA

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