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The human heart contracts from the first moment of the life until the last one. 1______________________________. Physiologists have determined that in the adult the heart makes from 60 to 72 beats per minute. 2____________________________. Research work has determined that rate of the heart beat increases depending on different emotions.
Each beat of the heart is followed by a period of rest. 3_______________________________.
Each cardiac cycle consists of three phases: the first phase of short contraction – the atrial systole, the second phase of a more prolonged contraction – the ventricular systole. The period of rest is called the diastole.
4_______________________________.
The contractions of the heart pump the blood through the arteries to all parts of the body.
In children the rate of the heart beat is much higher.
Each contraction and a period of rest compose a cardiac cycle.
Research work of many physiologists has estimated the role of the ventricles as the main pump of the human heart.