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Endocrine System(MR)
Question | Answer |
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Function of the Endocrine System | Glands continuously secrete produced calld hormones, which are chemical messengers that deliver stimulatory or inhibitory signals to target cells as a reslt of a feeback mechaism, oce secreted, hormones usually rein present in the body for 4 to 6 hours. |
Thyroid Gland | Overlies thyroid cartilage below the larynx |
Thyroid hormones | Accelerate cellular raction in most body cells (Thyroxine, Triioidothyronine, Calcitonin) |
Thyroxine | Stimulates metabolic rate, essential for normal physical and mental devlopment) |
Triiodothyronine | inhibits anterior pituitary secreation of thyroid stimulating hormone |
Calcitonin | decreases loss of calciumfrom bone; promotes hypocalcemia; actin opposite that of parathormone |
Small glads embeded in the posterior pat of thyroid | Parathyroid gland |
Parathyroid hormone (parathormone) | 1 Increases bood calcium concentration 2 Decreases blood phosphate concetration b slowing it reabsoption fromthe kidnes, thereby decreasing calcium loss in urine. |
How des Parathyroi hrmone increase blood calcium concentration | A Breakdown of bone with relsease of calcium ito blood (requies the active formof vatamin D) B Calcium absrption from intestine into the blood C Kidney tubule reabsorptio of calcium |
Two closely associated structures, adrenal medulla and adrenal cortex positioned at each kidneys superior border | Adrenal glan |
Adrenal hormones | Adrenal medulla and adrenal cortex |
Adreal medulla | produces two catecholamines epinephrine and norepinephrine |
Stimulate liver an skelealmuscle to break down glycogen to produce glucse | Adrenal medulla |
Inreases oxygen use and carbon doixid production | Adrenal medulla |
Increase blood concentation of free fatty acids through stimulation of lipolysis in adipose tissue | adrenal medulla |
cause constiction of nearly allblood vessels of body thus increasing totalperipheral resistance and arterial pressure to shunt blood to vital organs | adrenal medulla |
increases heat rate and force of contraction and thus raise cardiac output | adrenal medulla |
inhibit contractions of gasrointestinal an uterine smot muscl | Adrenal hormones |
Epinephrine significantly dilates bronchial smooth muscles | Adrenal hormones |
Adrenal Cortex: | secertes the mineralocorticoid aldosterone and the glucocorticods cortisol and crticosterone |
Markedly accelerates sodium and water reabsorption by kidney tubules | aldosterone |
markedly accelerats potassium excretion by kidney tubules | aldosterone |
Aldosterone secretin increases as sodium ion decrease or potassium ions increase | aldosterone |
accelerate mobilizaion and catabolim of tissue protein and fats | Cortisol and corticosterone |
accelerate mobilization an catabolism of tissue protein and fats | Cortisl an Corticosterone |
decrase antiboody formain (immuosuppressive, antiallergic effect) | Cortisl an Corticosterone |
slow the prolifeation of fibroblasts characteristic of imflammatio | Cortisl an Corticosterone |
decease adrenocorticopic homone ACTH secretion | Cortisl an Corticosterone |
Mily accelareate sodium and watr reabsorption an potassium excretion by kidney tubules | Cortisl an Corticosterone |
Increase rlease of coagulatio factors | Cortisl an Corticosterone |
Where is the Pancreas located | Retroperitoneal in abdominal cavity |
Pancreatic hormones regulate? | glucose and protein homeostasis throughte action of insulin and glucagon. |
Insulin is secreted by | islets ofLangerhans |
Insulin promotes | te cellula uptake of glucose |
Insulin stmulates | itacellular macromolecular synthesis, such as glycogensynthesis (glyconeogeisis), fat synthesis (lipogenesis) and protein synthess. Also stimulates cellular uptake of sodium and potassium. |