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Endocrine Adrenal gland And Pancreas
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Adrenal gland Structure Cortex ◦ Glucocorticoids Chemical nature Effects Control of secretion ◦ Mineralocorticoids Effects Control of secretion Medulla ◦ Catecholamine s
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Adrenal gland
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Adrenal cortex ◦ 80% of an adrenal gland’s total weight ◦ Zona glomerulosa Mineralocorticoids ◦ Zona fasciculata Glucocorticoids ◦ Zona reticularis Androgens
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Adrenal cortex Cortex ◦ Activity stimulated by ACTH (regulates mainly glucocorticoids & androgens). Cortical hormones ◦ Mineralcorticoids Aldosterone regulate salt and water balance ◦ Glucocorticoids Cortisol regulate glucose metabolism and the immune system. ◦ Gonadocorticoids Androgens Estrogens
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Adrenal cortex Glucocorticoid hormones Most potent naturally occurring glucocorticoids is cortisol They are carried by plasma proteins: albumin and globulin. Only 2% are not bound, free in the circulation and are biologically active. It shows diurnal variation; increases early morning and decreases at night.
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Effects of cortisol On carbohydrates ◦ Stimulation of gluconeogenesis by the liver ◦ Increase in glycogen storage in liver cells ◦ Decreased glucose utilization by the cells On protein ◦ Catabolic effect in all body cells except the liver ◦ Mobilization of amino acids from muscles. ◦ Decreased protein synthesis On fat ◦ Mobilization of fatty acids from adipose tissue
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Effects of cortisol Anti-inflammatory ◦ Stabilizes lysosomal membrane ◦ Reduces degree of vasodilatation ◦ Decreases permeability of capillaries ◦ Decreases migration of white blood cells ◦ Suppresses immune system
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On blood cells Increase RBCs Decrease lymphocytes & eosinophils. Increase neutrophils. Skin Decrease collagen & protein synthesis. Decrease fibroblast proliferation and healing.
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Bone Inhibit bone matrix formation. Anti-vitamin D effect on bones GIT: Increases HCL formation.
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Abnormal high cortisol level Cushing’s sydndrome Causes ◦ Pharmacologic ◦ Pituitary adenoma 75- 90% ◦ Adrenal adenoma, carcinoma ◦ Ectopic ACTH
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Characteristics of Cushing’s disease Hyperglycemia Hypertension (Salt & water retention). Moon face, buffalo neck, abdominal obesity, thin limbs, due to redistribution of fat and lipolytic effect and catabolic effect on proteins. Increased susceptibility to infection. Frequent fractures.
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Adrenal cortex Mineralocorticoid hormones: Aldosterone Most potent naturally occurring mineralocorticoid is aldosterone Effects: Affect ion transport by epithelial cells Increase the activity of the sodium pump of the epithelial cells; distal tubules of the nephron, sweat glands, salivary & intestinal glands. Cause sodium retention and potassium and hydrogen loss by the kidney. Water is secondarily absorbed following sodium. Regulated by the renin-angiotensin system
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Aldosterone Regulation of secretion Angiotensin II Angiotensin II S K (serum potassium conc.) S K (serum potassium conc.) Major modulators Minor regulators: ACTH Serum sodium
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Regulation of Aldosterone secretion
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Adrenal medulla Innervated by the sympathetic nervous system& secretes nor-adrenallin
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Endocrine function of pancreas
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Pancreas Endocrine Exocrine Islets of Langerhans Clusters of cells scattered between the acini between the acini 4 types of cells
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Endocrine Pancreas
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Major cell types of the Islets of Langerhans and the Hormones they produce Name Hormone produced Percentage of total Islet* Alpha cell Beta cell Delta cell F cell GlucagonInsulinSomatostatin Pancreatic polypeptide 2560101 *The remaining 4% consists of connective tissue and blood vessels.
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Endocrine Pancreas Insulin ◦ Secretion is promoted by increased blood glucose levels. ◦ Facilitates the rate of glucose uptake into the cells of the body& decrease blood sugar level. ◦ Anabolic hormone: Synthesis of proteins, ◦ Lipogenic: (+)lipids formation in adipose tissues& inhibit lipid breakdown by lipase
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Blood glucose Cells in pancreatic islets Insulin secretion Cellular uptake of blood glucose Blood glucose GlucoseGlycogenGlucoseTriglyceride Liver and skeletal muscle Adipose tissue Effects of Insulin
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Endocrine Pancreas, cont,…. Glucagon ◦ Secretion is promoted by decreased blood glucose levels ◦ Stimulates glycogenolysis, gluconeogenesis, and lipolysis Somatostatin ◦ Possible involvement in regulating alpha and beta cell secretions
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Cause Inadequate secretion of insulin Defects in the action of insulin hyperglycemia and glycosuria) Metabolic disturbances ( hyperglycemia and glycosuria)
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Types of Diabetes Type 1 Diabetes Affects children Cause : inadequate insulin secretion Treatment : insulin injection Type 2 diabetes Affects adults Cause defect in insulin action Treatment : diet or OHA diet or OHA
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