Question

You are walking down the street. All of a sudden, you hear a huge dog barking. It runs towards you and jumps over its fence and begins to run at you. You turn around and run down the street. Thankfully, you reach the end of the street and cross at the corner. The dog stops at the corner and barks you on your way. As you get to the other side, you stop and breathe deeply, attempting to recover, emotionally and physically, from what just happened. Your muscles are on fire. Explain the processes of energy usage taking place in your muscles throughout this experience. When was oxygen used? Did you ever use the glycolysis pathway? When did lactic acid come in?

Answer 1

The processes of energy usage that is taking place in my muscles throughout this experience is that there is rapid break down of glucose for the body usage in the presence of reduced oxygen.

What is glycolysis?

Glycolysis is defined as the metabolic pathway used by the body to break down the end product of carbohydrate digestion known as glucose with the aim of generating ATP as the form of energy for body use.

During sudden increase in the activities of the body, such as in fight and flight situations where we need to escape from an impending danger such as from a barking dog, adrenaline is being secreted into the blood leading to an increase in glucose uptake and it's cell utilisation.

The metabolism of glucose by the muscle cells of the body is an aerobic process therefore oxygen is being utilised at the beginning of the body exercise before reaching the end of the street.

But as the strenuous exercise continues, at the recovery stage there is reduction of oxygen at the cellular levels leading to the production of lactic acid from anaerobic metabolism of glucose.

Learn more about glycolysis here:

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