# Study Of Lung Capacity Of An Individual By Using Spirometer

2878 words - 12 pages

Vital Capacity (VC)

Trial 1

Trial 2

Trial 3

VC Highest Value

3800

3700

3900

3900

Tidal Volume (TV)

Total for five breathes

Average

2000

400

Expiratory Reserve Volume (ERV)

Trial 1

Trial 2

Trial 3

Average

1800

1800

1800

1800

Inspiratory Reserve Volume (IRV)
VC-(TV+ERV)

1700

Inspiratory Capacity (IC)
VC-ERV

2100

Residual Volume (RV)

1200

Total Lung Capacity (TLC)
VC+RV

5100

Table 1 : Various respiratory volumes and capacities of a normal personTable 2 : Various respiratory volumes and capacities of a normal person
Vital Capacity (VC)

Trial 1

Trial 2

Trial 3

VC Highest Value

4200

4200

4100

4200

Tidal Volume (TV)

Total for five breathes

Average

2400

480

Discussion :In the experiment, the vital capacity and tidal volume of a person before and after experiment is investigated. The highest capacity of the subject at rest is 3900 cc whereas after exercise the highest capacity of the subject is 4200cc which is higher compared to the person who is at rest. This is because, when a person exercise the demand of oxygen for the body cells increases and carbon dioxide output rise and as a result, both the tidal volume and ventilation rate increase and so maintain an adequate gas concentration in the lung for rapid gaseous exchange. However, the pattern of change is quite complex and it varies with the level of exercise, too. Thus, contraction of the diaphragm and intercostal muscle become more forceful. As a result, the lung capacity of a person after exercise is larger. Moreover, the tidal volume of a subject at rest is 400 cc which is obtain from five breathes because the value of measurement for one breath is too small to be measured. However, the tidal capacity of the subject after exercise is 480cc which is greater than that of a person who is at rest. Besides the expiratory reserve volume is 1800cc whereas inspiratory reserve volume is 1700 for the subject at rest. Inspiratory capacity of the subject is 2100cc. In the experiment, the subject is a male so residual volume of a male is 1200cc which is given for the experiment purpose.However, the lung capacity is different for different people. There are some factors affect the lung capacity of a person which is gender, age, fitness level of a person, height weight and so on. Thus, some factors have to fixed in order to study the lung capacity of a person. For instance, the lung capacity of a male is always higher than that of a female.There is some precaution and safety measures in the experiment. First and foremost, the spiropet must be kept horizontal during measurement. If it is not kept still, the vanes cannot revolve evenly and measurements result will not be correct. Moreover, when using, it is important that the small holes which are at the side of the upper are not cover up with your hands. When used frequently, water drops and saliva will condense inside. Accuracy is lost. Thus, once every ten measurements, the lower body is removed and inside is cleaned with a cloth. It is easily removed by turning it clockwise. Another thing to point out is that spiropet is a precision instrument like a watch and hence it must be handled carefully. Similarly, 3 replicate readings are taken the average reading are calculated to increase the reliability and validity of the results. It is also made sure that there is no leaking when the subject breathes air into the spiropet. After the experiment, the mouthpiece should be cleaned and further disinfected to prevent any infections among the students. In addition, the experimental subject should not inhale the air from the Spiropet because there is a possibility of infection especially if it is used for a number of times by many people. Moreover, the experiment should not be conducted on individuals who has recent heart attack. Lastly, if the subject feels light headed, faint, short of breath, or experiences chest pain, the experiment should be stopped at once.Conclusion :Hypothesis is accepted. Exercise will increase the lung capacity of a normal person.Limitation :Everyone has his own unique gene, although both person are same gender, age, fitness level, height and weight, lung capacity will still be different for both of them. This will lead to inaccuracy of the results.Although both person have same fitness level, the amount of physical activity have been done in order to get values of various respiratory volumes and capacities is difficult to determine. We cannot control both person run at the same speed. As a result, different amount of physical activity will result in different value of lung capacities. This is definitely leading to inaccuracy in result.Further Study :The lung capacity of the subjects with different gender.The lung capacity of the subjects with different weight.The lung capacity of the subjects with different physical fitness level.Bibliography :http://www.fi.edu/learn/heart/systems/respiration.htmlhttp://science.jrank.org/pages/6398/Spirometer.htmlhttp://www.duke.edu/~ajs9/framesite/BME154.pdfhttp://www.practicalbiology.org/areas/advanced/cells-to-systems/ventilation-systems/using-a-spirometer-to-investigate-human-lung-function,94,EXP.htmlC J Clegg, Edexcel Biology for AS, Hodder Education, 2008, pg123-126Edexcel AS Biology, A Pearson Company, 2008, pg158-160

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