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| Topic: |
Science
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| Number of pages / Number of words: |
3 / 733 |
Essay's paper body
a two-chambered
heart? (2 marks)
The advantages of having a 4-chambered heart versus a two-chambered heart is that there is an increased efficiency in separating oxygenated blood from deoxygenated blood. This is needed for a high metabolism in mammals, as well as it allows for various pulmonary and systemic blood pressures...
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Another advantage would be that there is a better supply of blood to the lungs and the rest of the animal's body, which is needed due to the animal's increased size and complexity as compared to a fish or amphibian which has a two and three-chambered heart respectively.
7) Why is the trachea of the rat hard and ridged? Why is the esophagus soft and
expandable? (2 marks)
The trachea of the rat is made up of rings of cartilage...
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General points of the essay
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