Week 8 Endocrine

Week 8 Endocrine - (calcium stays in the bones) and...

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Thyroid Hormone 
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Needs iodine  Maintains metabolic rate  Maintenance of development of  nervous system  Regulates growth 
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Calcitonin 
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Lowers blood calcium  Feedback system – blood calcium    calcitonin secretion    blood calcium(calcium stays in the bone;  increase excretion of calcium in urine) 
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Parathyroid Hormone 
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Raises blood calcium levels  Feedback System: Blood calcium levels Parathyroid Hormone secretion blood calcium levels Calcium is released from bone by osteoclasts (breakdown of bone) Reabsorption of calcium in the kidneys so less excretion Stimulation of calcitriol production by kidneys so increased calcium absorption by digestive tract
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Thyroid Hormone 
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see pg. 622 for synthesis, storage, and secretion  Derived from tyrosine Stimulated by TSH from pituitary
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Calcitonin 
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Lowers blood calcium  by  inhibiting  breakdown of bone  by osteoclasts 
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Unformatted text preview: (calcium stays in the bones) and stimulating excretion of Ca by the kidneys Calcitonin responds directly to an elevation in concentration of blood calcium Parathyroid Glands Parathyroid cells are also called chief cells or principal cells Also monitor blood calcium levels PTH is secreted when blood calcium levels are low - parathyroid hormone elevates blood calcium by Mobilizing calcium from the bones (breakdown by osteoclasts), reduces urinary excretion of calcium, and increases absorption of calcium from the digestive tract by stimulating the formation of calcitriol Calcitriol Steroid hormone Secreted by the kidneys in response to PTH Functions to stimulate calcium and phosphate absorption from the digestive tract...
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This note was uploaded on 02/11/2010 for the course AHS 132 taught by Professor Klinger during the Spring '09 term at Nassau CC.

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Week 8 Endocrine - (calcium stays in the bones) and...

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