Transcription of Chapter-22
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Chapter-22
[144] Chapter-22 CHEMICAL COORDINATION ANDINTEGRATIONPOINTS TO REMEMBERE ndocrine glands : These are ductless glands which secrete hormones directlyinto the blood : Non-nutrient chemicals, synthesised in trace amounts, acts asintracellular messengers and are specific in their : It is basal part of diencephalon. Has neurosecretory cells called nuclei which produce hormones to regulate the synthesis and secretion of pituitary gland hormones. Two types of hormones released are :Releasing hormones : Stimulate secretion of pituitary hormones, , Gona-dotropin releasing hormone stimulates pituitary gland to synthesise hormones : Inhibit secretions of pituitary hormones, , Soma-tostatin inhibits secretion of growth gland : Located in bony cavity called as sella tursica. Attached to hypothalamus by a stalk. Divided anatomically into : Adenohypophysis and Neurohypophysis.
[146] • Also secretes a protein hormone called Thyrocalcitonin (TCT) which regu- lates blood calcium level. (d) PARATHYROID GLAND : • Present on back side of thyroid gland.
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