Outline the structural changes that have taken place in the aortic arches of sharks, lungfishes, frogs,...
Outline the structural changes that have taken place in the aortic arches of sharks, lungfishes, frogs, birds, and mammals. For each group of vertebrates, discuss the functional significance of these changes.
Homework Answers
Solution:
The aortic arches of sharks have structurally changed to form gills due to evolution. The functional significance involves the need of respiration under water.
In lungfishes the aortic arches have structurally changed to form gills and pulmonary circulation. The functional significance is to provide the best way of respiration.
In frogs the aortic arch is bilaterally symmetrical . The flow of blood takes place through atrium and ventricle. The functional significance is respiration.
In birds the aortic arch provides the divided flow of blood. The functional significance is aerial respiration.
In mammals the aortic arches are structurally changed for the flow of the blood in the heart. The functional significance is respiration on the land.
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