Endocine System

Endocine System - Lab Chapter 27 Functional Anatomy of the...

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Unformatted text preview: Lab Chapter 27 Functional Anatomy of the Endocrine Glands 1 2 Major Endocrine Organs Figure 16.1 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 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 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 6 Pituitary (Hypophysis) Figure 16.6 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 8 Pituitary-Hypothalamic Relationships: Anterior Lobe Figure 16.6 The six hormones of the adenohypophysis: Abbreviated as GH, TSH, ACTH, FSH, LH, and PRL 9 Adenophypophyseal Hormones 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 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 Stimulates the normal development and secretory activity of the thyroid Triggered by hypothalamic peptide thyrotropin- releasing hormone (TRH) 12 Thyroid Stimulating Hormone (Thyrotropin) Stimulates the adrenal cortex to release corticosteroids Triggered by hypothalamic corticotropin-releasing hormone (CRH) in a daily rhythm 13 Adrenocorticotropic Hormone (Corticotropin) 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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This note was uploaded on 01/06/2012 for the course BIOL 2402 taught by Professor Elainefanin during the Spring '11 term at Collins.

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Endocine System - Lab Chapter 27 Functional Anatomy of the...

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