In anaerobic respiration, is any gas produced?

I'm asking this in reference to the measuring oxygen uptake experiment.

My teacher said that if the organisms are anaerobically respiring, they produce no gas, and if there's no soda lime (or KOH) then there'll be no pressure change and the liquid in the tube won't move.

But I read in my book that a waste product of anaerobic respiration is CO2, so I'm not sure.

This is Edexcel Biology A2 Unit 5.

Reply 1

Crankyla

In plants and microorganisms, CO2 is produced, along with ethanol. In humans, lactic acid is produced.

Plants/Microorganisms: Pyruvate + reduced NAD --> ethanol + CO2
Humans/Animals: Pyruvate + reduced NAD --> lactic acid (lactate) + NAD