when we breathe out we breathe out CO2. where dose the carbon comee from?

Answer 1

the carbon comes from the breakdown of sugars (glucose is the primary example), amino acids, and lipids. These things are broken down to provide cells with energy, making ATP to power active transport, power intercellular reactions, etc.

Answer 2

Respiration:
Glucose + Oxygen = Carbon Dioxide + Water + Energy

There are some other steps involved but I don't remember them anymore. Anyway, the organic molecules like carbohydrates and fats that your body digests and turns into energy contain carbon.

Answer 3

The CO2 is in your blood and muscles and is the product of processes that occur in your body. It is a gas exchange. You breathe in oxygen which is carried by your lungs to your blood and muscles and exchanged for CO2 (which is taken out again).

Answer 4

The CO2 comes from the glucose being oxidized in your body...


During respiration, glucose first undergoes glycolysis...

The production of CO2 occurs in the transition step from glycolysis to TCA cycle where pyruvate (3 carbons) is decarboxylated to acetyl-CoA (2 carbons) wtih loss of 1 CO2...

Another two steps in TCA cycle where CO2 is lost is when isocitrate (6C) is being decarboxylated to alpha-ketoglutarate (5C) with loss of 1 CO2 and alpha-ketoglutarate (5C) is being decarboxylated to succinyl-CoA (4C) with loss of 1 CO2...

the oxygen from CO2 does not come from the O2 you breath in... the O2 you breath in is reduced to water in the end of aerobic respiration...

Answer 5

ejc11 correct