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describe the hormones of the THYROID, PARATHYROID and ADRENAL GLANDS and their impacts on the biology of a mammal (see Figure 4.16 option of prodhormone secretion om cascade pathway STMAS Thyroid hormone verb Norge Semory med by sending nenemube to coll the hypothal Grati పాలం body wa bid celine poh yo от retimulates in the od gland to eroid tory toate Negative the hed IS thyrotropin mo the story C body wa bod Thyroid hormone in the Con and body throughout Thyroid body ht to control energetiche odres RESPONSE to and tive Author Syd hormone from the hypothman from the waterputar og megfeedback on the Thy and in the threads Figure 5.19 Stress and the adrenal gland Figure 45.18 The roles et parathyroid hormone in regulating the blood calcium vel in mammas NORMAL LOGO LEVEL காண்க cuted het Dros option to bed here ton ofte Fyod how

5 Figure 45.16 Regulation of thyroid hormone secretion: a hormone a cascade pathway Thyroid hormone STIMULUS level drops below the Neurosecretory normal range. Sensory cell in the neurons respond by hypothalamus sending nerve impulses to neurosecretory cells in the hypothalamus Circulation throughout body via blood Thyroid gland TRH Negative feedback Neurosecretory cells secrete thyrotropin releasing hormone (TRH) into the blood, which carries it to the anterior pituitary TSH stimulates endocrine cells in the thyroid gland to secrete thyroid hormone it, and into the circulatory system Thyroid hormone TRH causes the anterior pituitary to secrete thyroid stimulating hormone (TSH, also known as thyrotropin a) into the circulatory system, TSH Anterior pituitary Circulation throughout body via blood Thyroid hormone level increases in the Circulation blood and body throughout tissues. Thyroid body hormone acts on via blood target cells throughout the body to control bioenergetics help maintain normal blood pressure, RESPONSE heart rate, and muscle tone, and regulate digestive As its level returns to the normal range and reproductive thyroid hormone blocks TRH release functions from the hypothalamus and TSH release from the anterior pituitary, forming a negative feedback loop that prevents overproduction of thyroid hormone. Thyroid gland TSH stimulates endocrine cells in the thyroid gland to secrete thyroid hormone, and TO) into the city