Why does your heart beat?

The video tutorial explains how tires go flat when air escapes and how a pump can refill them. It draws an analogy between a pump and the human heart, describing how the heart pumps blood throughout the body. The tutorial also covers how the heart rate changes with activity levels, such as resting and exercising, and compares the function of a bicycle pump to the heart's role in circulating blood.

Describe the process of blood circulation in relation to the heart.

What causes the heart to beat faster during exercise?