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Metabolic effect of hormones , Tissue and organ metabolism - Heart , Liver

Metabolic effect of hormones , Tissue and organ metabolism - Heart , Liver ط      Hormonal Regulation of fuel metabolism ط      Metabolic effects of hormones : Epinephrine ,Glucagon ,Insulin ط Cardiac Muscle : Structure and metabolic characters

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Metabolic effect of hormones , Tissue and organ metabolism - Heart , Liver

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  1. Metabolic effect of hormones , Tissue and organ metabolism- Heart , Liver ط     Hormonal Regulation of fuel metabolism ط     Metabolic effects of hormones : Epinephrine ,Glucagon ,Insulin طCardiac Muscle : Structure and metabolic characters ط     Fuel used , interaction of Fat and Carbohydrate metabolism ط     Effect of  extra work طLiver : Metabolic functions of the liver ط     Fuels used by the liver, Integration of metabolism and role pf the liver                                            L5  884-897, 902-909  ;  D4   1018 -9 

  2. Heart Muscle · Like skeletal musle, does not store large amount of lipid and glycogen for ATP fig23.12 · But have small amount of phosphocreatine · Differ from skeletal muscle in that it is continuously active · Has complete aerobic metab · Abundant in mitcoh (1/2 vol of cell) · Good blood supply · The fuel is mainly free FAs but also glc and KB · Oxidation is through TCA cycle and phosphorylation to generate ATP

  3. Liver ·  Process and distribute nutrients fig23.12, fig23.14, fig23.15 ·  Diet (lipid, carb, prt) are enz hydrolyzed, absorbed go to liver (Kupffer cells & Hepatocyte) ·  Bilirubin (bile), BA (chol), glycogen (glc), TG (FA), glc and FA oxid

  4. Tissue and organ metabolism: Brain and Adipose tissues طBrain : Energy needs and metabolism of the brain ط     Fuels used by the brain طAdipose tissue : Metabolic role of adipose tissue , Effect of hormones on it ط     Interrelationship of carbohydrate and lipid metabolism                                     L5  897-902 ;  D4   269-70 , 920-1 , 928-9

  5. Adipose Tissue · Consists of adiposcytes (fat cells) fig23.16 · Stores 65% of TG · Have glycolytic metab, TCA cycle, oxid phosph, converts glc to FA to be stores as TG · Lipoprotein arriving from liver are VLDL · Lipase release FAs (70% are re-esterfied to TG) · cannot used glycerol (no glycerol kinase) · Glc come from pyr by PEP CK · Brown adipose tissue (infants) generates heat (not ATP)

  6. Brain · Uses energy for transmission of electrical impulse · Neurons use only glc as fuel fig23.20 · KB (b-HB) oxid by glycolysis and TCA cycle · Astrocytes are major cells in brain can oxid FA (as KB) uses 20% of O2 fig23.21 · Brain store little glycogen, so it is dependent on bld glc · Electron flow (resp chain) provides almost all ATP used by neurons · Memb contains Na+/K+ pump (ATPase antiport): 3 Na+ out / 2K+ in causing electrical signal (action potential)

  7. Blood · Carries O2 metabolites and hormones ·  Transports nutrients from s.intest to liver and AT then to other tissues ·  Transports waste from tissues to kidneys for excretion ·  Transport hormones from one tissue to another (signal) ·  Adults have 5-6 litres bld: 50% are cells and 50% plasma fig23.22 ·  Fuels are provided by FA, Glc, KB fig23.29

  8. Integration A. Tissues: · Glycolysis occur in all cells (no O2) fig7.2 except brain fig7.3 · RBCs lack mitoch unable to convert pyr to CO2 & H2O · Cornea, lens, retina have limited bld supply & lack mitoch · Kidneys, testis, leukocytes & w. muscle are almost dependent on glycolysis for ATP (have few mitoch) B. Others: · Stores polysach. (starch / glycogen) lead to glc source · Disach. (lactose, sucrose) lead to glc as source · Hormones (Glg/Ins) lead to glc control

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