The Body's Response to Exercise - Heart Beat

When we exercise, certain physiological changes occur in our bodies. SDA elementary students are learning why these changes occur. For example, when we start to move faster and work harder, our hearts respond by beating faster. The reason for this is the greater demand for blood (oxygen, energy) coming from our muscles. In order for our muscles to perform at a higher intensity, the heart must respond by supplying more blood to the muscles. This allows the muscles to contract with the force necessary to sustain movement.