Low blood hormone causes target organ to atrophy

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Unformatted text preview: blood Osm / › blood volume / ›blood pressure. • Oxytocin: ›contractility of smooth muscle of repro. tract & mammary glands fl orgasm / birth / milk ejection reflexes. Anterior Pituitary Trophic Hormones Trophic: “feeding” • Stimulate activity of other glands. “Master Gland” • Stimulate growth of target tissues • High blood [hormone] causes target organ to hypertrophy. • Low blood [hormone] causes target organ to atrophy. Control of Pituitary Releasing Hormones Regulating the Master Gland 1. Releasing (stimulating) and inhibitory hormones from the hypothalamus. 2. Negative feedback by hormones secreted by the target glands. Feedback Control of the Anterior Pituitary E.g., sex hormones: 1. Hypothalamus secretes releasing homone (GnRH ) to stimulate Ant. Pituitary. 2. Ant. Pituitary secretes gonad otropin s (LH & FSH) to stimulate gonads to: 1. Grow & mature 2. Secrete sex steroids 3. Sex steroids from gonads feedback to inhibit pituitary from secreting more gonadotropin . H...
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This note was uploaded on 09/02/2011 for the course BIOL 6a taught by Professor Staff during the Fall '10 term at DeAnza College.

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