Question

after exercising, theo is aware that anaerobic respiration occurred in his body because his muscles ache. which substance caused his muscles to feel sore?
lactic acid
glucose
carbon dioxide
glycogen

Explanation:

During anaerobic respiration in human muscles, glucose is broken down without sufficient oxygen. This process produces lactic acid as a by - product. The accumulation of lactic acid in the muscles causes the feeling of soreness. Glucose is the starting molecule for respiration (both aerobic and anaerobic). Carbon dioxide is a product of aerobic respiration (when there is enough oxygen, glucose is broken down completely to carbon dioxide and water). Glycogen is a stored form of glucose in the body.

Answer:

lactic acid