In humans, which substance is produced anaerobically during strenuous activity?
A. Alcohol.
B. Glycogen.
C. Lactic acid.
D. Carbon dioxide.
Lactic acid is a product of anaerobic respiration in humans. It is converted back to pyruvic acid when oxygen is again present. Glycogen is a complex carbohydrate and is the form we store our sugar in our liver, carbon dioxide is produced during anaerobic activity but also during aerobic activity, and alcohol is a waste product of anaerobic activity of certain organisms such as yeast, not humans.