This short film explains how the heart and circulatory system work, taking a close look at the four chambers, two sides, and the valves of the heart. BBC Teach has thousands of free, curriculum ...

If you are worried about the consequences of these actions and are looking to improve your lifestyle for the betterment of your cardiovascular ... work your heart does, weakening its system ...

When a person takes part in exercise the cardiovascular ... When the muscles start to work, they need more oxygen so the respiratory system responds by getting more oxygen into the lungs.

it is the sympathetic system's job to increase the heart rate in situations of danger and fear, for example. "Proper cardiovascular function requires a balance between these two mechanisms ...

“Circuit training provides little-to-no rest and that makes the cardiovascular system work harder, thereby conditioning it more quickly and efficiently.” She goes onto explain that the heart ...