5.6 A few final thoughts
You will have seen from this section that it is difficult to talk about the heart without also talking about blood and veins and arteries. It is hard to isolate one body system or one body part and describe it by itself, without talking about other parts of the body as well. One of the important points that we would like you to remember about the biology of the human body is that everything is interlinked. An athlete hoping to maximise their performance in a sport has to work on all parts of the body, not just on their heart or lungs or leg muscles.