The Heart Of A Human

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The heart of a human is a vital internal organ consists of cardiac muscles, which pump and circulate blood contained oxygen, hormones and necessary nutrients throughout the body. Heart rate is the amount of poundings of the heart per unit of time, usually in beats per minute (bpm). The heart rate can change due to the body 's physical needs including oxygen absorption and carbon dioxide excretion. The normal resting heart rate of an adult human ranges from 60 to100 beats per minute. During sleep, the heart can beat slower in the range of 40-50 beats per minute, which considered normal. (Wikipedia, 2015)
From the initial observations, heart rates tend to vary from times to times especially with different activities such as standing, running and lying down. The purpose of this experiment is to identify what, if any, relationship exists between human 's heart rates with the different intensity levels of any physical exertion.
If a subject is exposed to different physical activity intensity levels for the same amount of time with the heart rate recorded in beats per one minute. Then, the subject 's heart rate will significantly increase in relation to the higher intensity degrees of any physical exertion.
The exercises and even the anticipations of increasing physical activities can trigger the response of autonomic nervous system to produce a more appropriate suite of physiological changes that prompt the body for the exercise.
The systems that support muscular
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