BCCB2000 Lecture Notes - Lecture 23: Blood Sugar, Renal Cortex, Transferase
Fed, Fasting, Starvation, and Diabetes
Dr Steven Bottomley
Pathways:
Pathway Substrates Products
Anabolic
Gluconeogenesis Lactate, Alanine, Glycerol Glucose
Glycogen Synthesis Glucose-1-phosphate Glycogen
Lipogenesis Acetyl CoA, Glycerol Fatty Acids,
Triacylglycerols
Ketogenesis Fatty Acids (Acetyl CoA) Ketone Bodies
Protein Synthesis Amino Acids Proteins
Catabolic
Glycolysis Glucose Pyruvate, NADH
TCA Pyruvate CO2, H2O, GTP, NADH,
FADH2, H+ and eventually
ATP
Glycogenolysis Glycogen Glucose-1-Phosphate,
Glucose
Lipolysis Triacylglycerols, Fatty
Acids
Glycerol, Acetyl CoA,
NADH
Proteolysis Proteins Amino Acids (Glucose or
Ketone Bodies),
eventually ATP
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Fatty Acid Synthesis Importance and Tissue Location:
-Fatty acids occur in almost all the complex lipids critical to cellular function
-Fatty acids provide the cells with a source of energy
-Fatty acid synthesis occurs in the cytosol of liver, adipose tissue, and mammary
glands
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Fed State:
-Fed state food is absorbed from intestine
oAbsorptive state
-Food meets immediate energy requirements
-Excess food (energy) leads to formation of storage forms of energy
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Document Summary
Fatty acid synthesis importance and tissue location: Fatty acids occur in almost all the complex lipids critical to cellular function. Fatty acids provide the cells with a source of energy. Fatty acid synthesis occurs in the cytosol of liver, adipose tissue, and mammary glands. Fed state food is absorbed from intestine: absorptive state. Excess food (energy) leads to formation of storage forms of energy. Oxidative processes exist in the fasting state: fasting occurs whenever an animal is deprived of food, postabsorptive/fasting/starvation. Postabsorptive state = from 3 to 16 hours after food intake. Fasting state = up to two days after food intake. Starvation > two days without food intake: biochemically a fasting state can be characterised by the release of particular hormones and the operation of particular metabolic pathways. During fasting the body needs to maintain a supply of glucose: about 2. 5mm in the human. Hypoglycaemia: a fall in the blood glucose below 2. 5mm, leads to cns dysfunction.