Test 2 Review

Test 2 Review - Test 2 Anterior Pituitary Hormones Hormone...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Test 2 Anterior Pituitary Hormones Hormone Target Action Prolactin Breast Milk production ACTH Adrenal Cortex Release corticoids GH Growth in length TSH Thyroid Gland Release T 3 4 LH♂ Leydig Cells Make testosterone LH♀ Follicle Ovulation FSH♂ Testes Spermatogenesis (inhibin) FSH♀ Ovaries Maturation of ova Somatomedins (Insulin-like growth factor) → initiator GH stimulates IGF release IGFs have a direct effect on target cells o As hormone (goes into blood) o As paracrine GH has some direct effects, but most thru IGFs Bone Growth Increase in width o Osteoblasts lay down new bone on outer surface o Osteoclasts resorb bone in inner surface of cavity Minimizes weight gain Increase in length o Osteoblasts lay down new bone at epiphyseal plates Control of Hypothalamic Tropic Hormone Release Neural input Hormonal - negative feedback Circadian rhythm o Suprachiasmatic Nucleus of Hypothalamus (SCN)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Negative Feedback Loops 6.6 Thyroid Gland see Chpt 21 Two thyroid hormones o Regulate metabolism o o Rate of O 2 consumption at rest ↑ BMR o ↑ rate of Na+/K+ pump o Permits many tissues to rapidly respond to Epi o Deficiency may lead to impaired brain function T 4 , tetraiodothyronine T 3 , triiodothyronine T 3 effects: o Stimulates cellular respiration by o Stimulate active transport Na/K pump o Lower [cellular ATP] o ↑ metabolic heat
Background image of page 2
Stimulates increased consumption of glucose, fatty acids & other molecules Calcitonin Regulates calcium levels in blood Parafollicular cells of thyroid secrete calcitonin Lowers [ blood Ca++] causing excretion in urine and/or uptake into bones Need Ca in bloodstream Roles of Ca ++ 1. Neuromuscular excitability o Hypocalcemia moves resting potential closer to threshold spontaneous muscle spasms leading to asphyxiation o Hypercalcemia leads to cardiac arrhythmias o ECF Ca ++ triggers heart contractions 3. Stimulus for secretion o Entry of ECF Ca ++ triggers NT release (goes in thru fast-ligand channel) 4. Maintains tight jct between cells o Intracellular cement 5. Blood clotting factor in clotting cascade 7. ICF Ca ++ = intracellular messenger Adrenal Glands (Suprarenal glands) 6.9 Hormones of the Adrenal Gland: Adrenocorticoids o Mineralocorticoids ( aldosterone ) from AC→ kidney regulates sodium and potassium levels o Glucocorticoids ( cortisol ) regulates body’s response to stress regulates metabolism o Sex hormones ( androgens ) give rise to testosterone regulate reproductive function renin ACE (angiotensin-converting enzyme) Angiotensinogen angiotensin I------- Angiotensin II Secondary Endocrine Organs Heart - atrial natriuretic peptide (ANP) o Regulates Na reabsorption by kidneys Kidneys – erythropoietin (EPO)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/12/2010 for the course BIOL 2160 taught by Professor Kt during the Fall '08 term at LSU.

Page1 / 23

Test 2 Review - Test 2 Anterior Pituitary Hormones Hormone...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online