KINESIOL 1YY3 Study Guide - Posterior Pituitary, Endocrine System, Anterior Pituitary
19 Apr 2014
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Document Summary
Chapter 17 the functional organization of the endocrine system. Glands that secrete chemical messengers (hormones) into circulatory system: directly changes cell physiology. Hormone characteristics: produced in small quantities, secreted into intercellular space, transported some distance in circulatory system, acts on target tissues elsewhere in body, regulate activities of body structures, ligands: more general term for chemical signals. Similarities: both systems associated w/ the brain. Epithalamus (olfaction, melatonin: may use same chemical messengers as neurotransmitter and hormone. N. s. secretes neuroendocrine peptides or neurohormones into circulatory system. Some parts of e. s. innervated directly by n. d. (adrenal gland) What are the general characteristics of hormones: stability, half-life. Short half-life > water-soluble hormones, rapid onset and short duration: communication. Interaction with target cell (must have cell recognition binding sites: distribution. Dissolve in blood plasma and are transported in unbound or are reversibly bound to plasma proteins (eg. lipid soluble steroid hormones) What are the three patterns of hormone secretion: chronic hormone regulation.
