Respiratory substrates

name the 6 respiratory substrates

* triglyceride
* glycogen
* glucose
* amino acid
* lactate
* ketone bodies

how are triglycerides respired?

1. split into fatty acids and glycerol.
2. fatty acids undergo beta oxidation to produce an acetyl group
3. glycerol is converted into pyruvate

how are amino acids and lactate respired?

converted into pyruvate

how are ketone bodies from the brain respired?

converted into acetyl group

why do lipids produce more ATP than proteins and carbohydrates in respiration?

* more C-H bonds
* bore hydrogen atoms
* can donate more to NAD+ and FAD+
* more reduced coenzymes means more electrons for the etc
* more protons pumped
* steeper proton gradient
* more ATP produced

RQ of carbohydrates

1\.0

RQ of proteins

0\.9

RQ of lipids

0\.7

what is RQ

RQ = CO2 produced / O2 consumed

why is the RQ of lipids so low?

lots of oxygen is used up to break down the several C-H bonds.

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very little CO2 is released