Bio180Physio - Lec2 Energy Metabolism

Explain how energy is stored in the body (3 ways)

stored under skin as fat
store other energy from carbohyrates→glucose→glycogen→ store in liver, will be the first resort for burning energy

glycogen in muscle can not be converted to supply other body parts

Why can’t we eat ATP directly? Explain reason, ATP structure, and the alternative way to get ATP

atp too unstable to eat directly → eat carbohydrates and lipids, oxidizing carbon chain to make ATP

where is glycolysis happening

in cytosol → extract energy from glucose

what are the two processes happening in the mitochondria

citric acid cycle → in the matrix

oxidative phosphorylation → across inner membrane
both require oxygen and extract energy from carbohydrates/fats/proteins

draw glycolysis and summarize products

4 ATP (net 2 atp), 2 NADH / H+ (net 0)
anaerobic pyruvate → lactic acid → 2ATP

aerobic → pyruvate to citric acid cycle → 38 ATP

explain intermediate step

glycolysis → pyruvate
in mitochondria matrix, pyruvate and CoA make acetyl CoA (+NADH and CO2)

draw and explain citric acid cycle

In matrix, endless cycle, uses the acetyl CoA from the intermediate step

draw and explain oxidative phosphorylation

hydrogen from the NADH / H+ or FADH2, plus O2, makes H2O → is a reactive chain producing ATP