When a person level of physical activity changes the circulatory system supplies body cell with amounts of nutrients and oxygen that are appropriate to sustain the new levy of activity. This statement illustrates the concept of

This statement illustrates the concept of Homeostasis.

Explanation:

When there exists an ability to balance between the internal factors and the external factors when there occurs a change in the environment is known as Homeostasis. It is the ability of balancing both the factors. It is present in human, plants and animals.

In human it is called as Homeostasis. and in animals and plants it is adaptation. This is very essential for the organisms to survive. Without this ability, all living organisms will face threat of death. Thus in the given statement the energy and the nutrients are supplied by the circulatory system in response to a change which is a physical exercise. thus it acts as an example of Homeostasis.