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From Lecture24 - Metabolic Network
5
Biology
Undergraduate 3
12/15/2009

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Term
What are the effects of Insulin?
Definition

Insulin (muscli, liver, fat)

  • Released in response to high blood glucose levels
  • Increases glucose uptake (muscle, liver, fat)
  • Stimulates glycogen synthesis (liver, muscle)
  • Stimulates glycolysis, Acetyl CoA production (liver, muscle)
  • Stimulates fatty acid synthesis (liver)
  • Increases triacylglycerol synthesis (fat)
Term
Hormonal Control of Carbhohydrate Metabolism in terms of Glucagon and Epinephrine (EPI)
Definition
  • Glucagon (liver)

Released in response to low blood glucose levels from the pancrease
Stimulates breakdown of glycogen
Stiumlates gluconeogenesis (synthesis of glucose)

  • Ephinephrine (muscle and liver)

Increases breakdown of glyogen
Stimulates gluconeogenesis (in liver)
Increases glycolysis (muscle

Term
What occurs from having Type 1 Diabetes?
Definition

Primary failure → little or no production of insulin

  • Destruction of pancreatic β cells (autoimmune)
  • Glucose cannot enter fat and muscle cells
  • Gluconegenesis in liver not turned off
  • High glucagon/Insulin ration stimulates glycogen breakdown
  • Excess glucose enters blood from liver
  • Uncontrolled breakdown of lipids and proteins, forming ketone bodies → lead to pH changes → long exposure can lead to coma and/or death.
Term

Things to remember about Calvin Cycle:

What are the stages?

How many ATP and/or NADPH molecules used?

Definition
  • Primary means of converting CO2 glucose/organic matter.
  • 3 ATP & 2 NADPH (from light reactions) → consumed for each molecule of CO2 converted into hexose.
  • Three stages: Carbon Fixation, Reduction, Regeneration
  • One CO2 enters cycle @ a time, but for synthesis of one GAP need 3 CO2 & 3 Ribulose-1,5-bisphosphate
Term
Glyceraldehyde-3-phosphate (GAP)
Definition
  • Primary product of Calvin Cycle → can be converted to fructose and something else.
  • For 1 GAP need: 6 NADPH, 9 ATP, 3 CO2
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