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„Heart beat” is the text about heart and its work. From this text we can learn sth about heart contracting for example that this activity is rhythmically and doesn’t need any external stimulus. This inherent capacity depend on heart’s development and build. We can find in this text also some interesting fact for example that isolated frog or turtle heart beats rhythmically for hours. In heart contracting cooperate among other thing heart muscle, sinus node, atrioventricular bundle and pacemaker. This components control and make heart beat. influence on this capacity have also nerves and hormones. The adrenaline for example cause “fight or flight” symptom. We can also learn something about Starling’s Law of Heart which tells about relationship between the increased venous return and the increased cardiac output. But this text is not only about heart beat. We can find also some in formations about illnesses which are connected with heart for example about ventricular arrhythmias which are very complicated and connected with another diseases.