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today bio - Endocrine Hormones of the Posterior Pituitary o...

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Endocrine Hormones of the Posterior Pituitary o ADH/AVP Kidney tubules for water retention o Oxytocin Breast feeding – stimulation of nipple mechanoreceptors – oxytocin release – muscle contraction in mammary glands and ducts – milk ejection Oxytocin – stimulates uterus to contract – stretches receptors in birth canal – positive feedback Hormones of the Anterior Pituitary o Hypothalamic-hypophysial Portal vein GnR, FSH, and LH Control Gonadal Function o GnRH Neurons in Hypothalams – GnRh - Anterior Pituitary – FSH (Follicle Stimulating Hormone) + LH (Luteinizing Hormone)– Ovaries or Testes – Estrogen or Testosterone – Negative Feedback for GnRH Neurons in Hypothalamus and Anterior Pituitary TRH Neurons in Hypothalamus – TRH – Thyrotrops in Anterior Pituitary – TSH – Thyroid Gland – T3 + T4 – negative feedback for TRH Neurons and Thyrotropes o T3 and T4 are modified versions of tyrosine, 6 ring structure, secrete protein into the extracellular space, becomes gelatinous Effects of thyroid hormones o Synthesized from tyrosines in thyroglobulin molecules o Mammals secrete T4 but T3 is more potent o Stimulates cellular metabolism, oxygen consumption, ATP production, protein synthesis, lipid breakdown, heat production o Hyperthyroidism High temperature, sweating, irritability
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This note was uploaded on 09/28/2010 for the course SOCI 305 taught by Professor Sternheimer during the Spring '10 term at USC.

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today bio - Endocrine Hormones of the Posterior Pituitary o...

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