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Endocine System - LabChapter27 FunctionalAnatomyof...

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            Lab Chapter 27 Functional Anatomy of  the Endocrine Glands 1
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2 Major Endocrine Organs Figure 16.1
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Hormones – chemical substances secreted by  cells into the extracellular fluids Regulate the metabolic function of other cells The precise response depends on the type of the   target cell 3 Hormones
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Hormones circulate to all tissues but only activate  cells referred to as target cells Target cells must have specific receptors to which  the hormone binds 4 Target Cell Specificity
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Pituitary gland – two-lobed organ that secretes  nine major hormones Neurohypophysis  – posterior lobe (neural tissue)  and the infundibulum Receives, stores, and releases hormones from the  hypothalamus Adenohypophysis  – anterior lobe, made up of  glandular tissue  Synthesizes and secretes a number of hormones 5 Gross Anatomy -Hypophysis
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6 Pituitary (Hypophysis) Figure 16.6
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There is a vascular connection, the  hypophyseal portal system, consisting of: The primary capillary plexus The hypophyseal portal veins The secondary capillary plexus 7 Pituitary-Anterior Lobe
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8 Pituitary-Hypothalamic  Relationships:  Anterior Lobe Figure 16.6
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The six hormones of the adenohypophysis: Abbreviated as GH, TSH, ACTH, FSH, LH, and PRL 9 Adenophypophyseal Hormones
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The hypothalamus sends a chemical stimulus to  the anterior pituitary Releasing hormones stimulate the synthesis and release  of hormones Inhibiting hormones shut off the synthesis and release of  hormones 10 Activity of the  Adenophypophysis
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The tropic hormones  Stimulates an endocrine gland instead of a target organ.  They are: Thyroid-stimulating hormone (TSH)  Adrenocorticotropic hormone (ACTH) Follicle-stimulating hormone (FSH)  Luteinizing hormone (LH) 11 Activity of the  Adenophypophysis
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Stimulates the normal development and secretory  activity of the thyroid Triggered by hypothalamic peptide thyrotropin- releasing hormone (TRH) 12 Thyroid Stimulating Hormone  (Thyrotropin)
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Stimulates the adrenal cortex to release  corticosteroids Triggered by hypothalamic corticotropin-releasing  hormone (CRH) in a daily rhythm 13 Adrenocorticotropic Hormone  (Corticotropin)
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Gonadotropins – follicle-stimulating hormone  (FSH) and luteinizing hormone (LH) Regulate the function of the ovaries and testes FSH stimulates gamete (egg or sperm) production Triggered by the hypothalamic gonadotropin-releasing  hormone (GnRH)  14 Gonadotropins
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In females
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