C. Insufficient oxygen is reaching the muscles
I found a quizlet with the answer for this question lol
Hope that helped! :)
Answer:
When you exercise it causes your muscles and your pearl your pures in your skin to produce sweat and cause pain to your nervous system telling you that is exhausting
Explanation:
Pyruvic acid supplies energy to living cells through the citric acid cycle (also known as the Krebs cycle) when oxygen is present (aerobic respiration), and alternatively ferments to produce lactic acid when oxygen is lacking (fermentation).Hope it helps
its like the human body rectum its there but serves no purpose but when we evolved we eveolved to eat different foods and different foods mean different digestion
I hope this counts - cell wall! helps keep most materials out but allows specific materials to pass through. animal cells do not have a cell wall
