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Cats
Obligate carnivores
Need protein to digest sugar
Carnivores
Low production of amylase (since little carbs are digested)
Produce glucose via gluconeogenesis
Convert amino acids to glucose
Slow, expensive energy-wise
Then use normal cell resp.
Gluconeogenesis
Done in liver
Deamination of amino acids
Carbon skeleton converted to pyruvate
Pyruvate → Reverse glycolysis → Glucose
Costs 6 ATP, glycolysis costs 2 ATP, generates 4 ATP
Gluconeogenesis energy cost > Glycolysis energy production
What happens to vitamins?
Fats-soluble are deposited
Water-soluble vitamins pass through