Heart Rate Investigation

Analysis
As seen in the processed data table, as the intensity of the exercise increases, so does the participant’s heart rate. The graph also supports this by demonstrating that the two variables have a close positive and linear relationship. The data points are close to the trendline which has a positive gradient of 0.3839. The r2 value of 0.9791 is very close to 1, meaning that it has a strong positive relationship. The value also shows that the two variables have a positive correlation in which one variable increases as the other also increases, which supports the other data collected. Furthermore, the error bars on the graph displays the standard deviation of the data points. At an intensity of 140 metronome bpm, the standard deviation

The hypothesis stated that as the intensity increases, then the heart rate will also increase. This is supported by the data collected. The graph shows that intensity and heart rate have a positive correlation which means that they will both increase at the same time in a linear fashion, validating the hypothesis. The r2 value of 0.9791 is also very close to 1 and the data points are near the trendline, meaning that the variables have a strong positive relationship. However, the error bars and standard deviation also demonstrates something that the hypothesis did not predict. The fact that the standard deviations of the lowest and highest intensity were lower compared to the other intensities in between suggest that there was less of a room for the heart rate to vary by increasing and decreasing. The lowest intensity did not result in a significant increase in heart rate, and as the heart rate after exercise cannot be lower than the resting heart rate, the spread of the data collected at the intensity of 100 metronome bpm is less. The standard deviation increases as the intensity increases due to the gap in exercise heart rate and resting heart rate. However, after the highest standard deviation (12.86) was reached at the intensity of 140 metronome bpm, the spread started to decrease. Eventually, at the

The heart is a part of the circulatory system, which is responsible for pumping blood all around the body to facilitate gas exchange and transport oxygen and important nutrients to the body’s cells (QASMT, 2018). Every pump of the heart can be felt as a pulse in certain parts of the body. However many times the heart pumps in a minute results in the heart rate of an individual, measured in beats per minute (bpm). All cells need energy to function, and the way they produce energy is through cellular respiration. In this chemical reaction, glucose and oxygen are used as reactants to produce water, carbon dioxide, and most importantly, energy. This process is shown by the chemical equation of C6H12O6 (glucose) + O2 (oxygen) CO2 (carbon dioxide) + H2O (water) + C10H16N8O13P3 (energy) (Kids.Net.Au, 2018). Exercise uses up the body’s energy at a faster rate than normal, meaning that cellular respiration will have to occur at a higher rate to produce enough energy to maintain the body’s homeostasis (Khan Academy, 2018). Hence, oxygen is also used at a higher rate and more carbon dioxide is also produced as a waste product. Too little oxygen and too much carbon dioxide is poisonous to cells, therefore more oxygen must be brought in while carbon dioxide is taken out. This is where the heart comes in. In order for the blood to circulate oxygenated blood from the lungs to the cells and transport carbon dioxide