It seems like you're referring to the aerobic phase of metabolism. Here's a step-by-step breakdown:

1. Ingestion: The process begins when you consume carbohydrates and fats. These macronutrients are broken down into glucose and free fatty acids respectively in the digestive system.

2. Absorption: These nutrients are then absorbed into the bloodstream and transported to the cells.

3. Glycolysis: Once in the cells, glucose undergoes a process called glycolysis, which breaks it down into a molecule called pyruvate. This process produces a small amount of ATP (the body's energy currency) and does not require oxygen.

4. Aerobic Metabolism: If oxygen is present, pyruvate enters the mitochondria (the cell's power plants) and undergoes a series of reactions known as the Krebs cycle. This process produces a large amount of ATP and requires oxygen, hence the term "aerobic".

5. Lipolysis: If the body's energy needs are not met by glucose alone, free fatty acids are broken down in a process called lipolysis to produce additional ATP. This process also requires oxygen.

6. Energy Utilization: The ATP produced in these processes is used to fuel various bodily functions, from muscle contractions to brain activity.

So, in the aerobic phase, oxygen is used to break down carbohydrates (in the form of glucose) and fats (in the form of free fatty acids) to produce ATP, which is used to meet the body's energy needs.

Question

It seems like you're referring to the aerobic phase of metabolism. Here's a step-by-step breakdown:

1. Ingestion: The process begins when you consume carbohydrates and fats. These macronutrients are broken down into glucose and free fatty acids respectively in the digestive system.

2. Absorption: These nutrients are then absorbed into the bloodstream and transported to the cells.

3. Glycolysis: Once in the cells, glucose undergoes a process called glycolysis, which breaks it down into a molecule called pyruvate. This process produces a small amount of ATP (the body's energy currency) and does not require oxygen.

4. Aerobic Metabolism: If oxygen is present, pyruvate enters the mitochondria (the cell's power plants) and undergoes a series of reactions known as the Krebs cycle. This process produces a large amount of ATP and requires oxygen, hence the term "aerobic".

5. Lipolysis: If the body's energy needs are not met by glucose alone, free fatty acids are broken down in a process called lipolysis to produce additional ATP. This process also requires oxygen.

6. Energy Utilization: The ATP produced in these processes is used to fuel various bodily functions, from muscle contractions to brain activity.

So, in the aerobic phase, oxygen is used to break down carbohydrates (in the form of glucose) and fats (in the form of free fatty acids) to produce ATP, which is used to meet the body's energy needs.

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