From your work on our circulation, you know that the heart is the organ that controls the movement of the blood around the body by pumping thousands of times every day.

You also know that the blood is our delivery system, delivering the substances that our body tissues need and then taking away their waste.

This activity should help you to link your knowledge about our circulation with how important exercise is for you and how our heart and blood is affected when your body is exercising.

Let's use this activity to help our understanding of the relationship between the normal functioning of the body systems and what can affect or change it.