- Level: International Baccalaureate
- Subject: Biology
- Word count: 1244
Investigating the Properties of Blood Vessels
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Introduction
Investigating the Properties of Blood Vessels Data Collection Length of Aorta Before and After Adding Slotted Masses (cm) � [0.05cm] Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Trial 6 Slotted Masses (g) [� 1g] Length after adding mass Length after removing mass Length after adding mass Length after removing mass Length after adding mass Length after removing mass Length after adding mass Length after removing mass Length after adding mass Length after removing mass Length after adding mass Length after removing mass 0 1.5 1.5 1.7 2.3 1.5 1.5 2.0 2.0 1.2 1.8 1.7 1.9 100 2.0 2.3 2.5 2.6 1.9 2.0 2.6 2.8 1.7 2.1 2.0 1.9 200 2.5 2.5 2.7 3.0 2.0 2.5 2.9 3.2 2.1 2.3 2.5 2.0 300 2.9 3.0 3.0 3.1 2.4 2.7 3.2 3.5 2.4 2.6 3.0 2.5 400 2.9 3.2 3.2 3.4 2.6 2.9 3.4 3.5 2.6 2.8 3.3 2.7 500 3.0 3.2 3.4 3.4 2.8 2.9 3.5 3.6 2.8 3.0 3.5 3.0 600 3.0 3.2 3.5 3.5 3.0 3.0 ...read more.
Middle
We hung different slots of masses to stretch an aorta and pulmonary artery, and then recorded the change in length. Based on our two graphs, there are larger gaps between the two trend lines in the pulmonary artery compared to aorta. This means that adding the weights caused a greater stretch in the pulmonary artery. Our processed data also backs up this conclusion. On average, the initial mass of the aorta was 1.6 cm. After adding and removing all the weights, the final mass was 1.8 cm, which meant that the aorta stretched about 0.2 cm. On the other hand, the pulmonary artery stretched from 1.4 cm to 1.8cm. It stretched 0.4 cm, which is about 0.2 cm longer than the stretch in the aorta. Our percent elasticity changes show us that the original length of the aorta increased by 15% and the pulmonary artery increased by 30%. Because the aorta's original length was closer to its final length than the pulmonary artery, it is more elastic. ...read more.
Conclusion
We ended up taking the average, and the variety allowed us to see the masses effect on different sizes. However, starting with vessels of the same length would have saved all the calculations for getting the average. When calculated, these averages were rounded to the nearest decimal point, which adds inconsistency. Instruct a few groups to start with a specific length and another group to do another length. Calculate the results separately and see the effect on the two different lengths. This way, we get variety and consistency as well. Limit in slotted masses There was a limit of 1000g and 700g for the weight of masses. This was to prevent the vessels from breaking. However, we could have tested the exact value of how much weight the vessels could have handled. This would have further enhanced our knowledge of the vessels' elasticity and what they are capable of handling. After completing the original procedure, cut a new strip of aorta and pulmonary artery and add masses until the blood vessels break. ?? ?? ?? ?? ...read more.
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