205textnotes02 - They are made in tissues all over the body...

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6. Control the reproductive processes. 7. Play important roles in behaviour. B. Classification of hormones: - There are 3 main types of hormones: 1. Peptide hormones 2. Steroid hormones 3. Amine hormones - The different chemical classes of hormones differ in: (Table 7-1) 1. Their synthesis and storage, 2. The way they are released from parent cells, 3. How they are transported in blood, 4. Their half-life, 5. The location of their targets' receptors, 6. The pathway activated upon binding of the hormone in the target cell, 7. The general target responses. B.1. PEPTIDE HORMONES: - They are composed of 3 or more amino acids (small peptides to large proteins and glycoproteins).
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Unformatted text preview: - They are made in tissues all over the body. - They constitute the great majority of hormones. B.1.1. Synthesis of peptide hormones (Figs. 7-3, 7-4):- Their synthesis does not differ from that of other proteins. a) Peptide hormones are synthesized as preprohormone in the rough endoplasmic reticulum of parent endocrine cell. Definition of preprohormone:- A preprohormone is a sequence of amino acids that contains 3 different elements: 1. A signal sequence, 2. One or more copies of a peptide hormone, 3. Other peptide sequences that may or may not have biological activities....
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