CARDIOLOGY
AORTIC STENOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In reptiles, birds and mammals the ____ aortic arch becomes the carotid artery.
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first
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second
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third
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fourth
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Explanation:
Detailed explanation-1: -Note: Both left and right arches are found in the adult reptiles and amphibians. However, in adult mammals only the left arch is found while in adult birds only the right arch is found.
Detailed explanation-2: -In reptiles, the gills are fully replaced by lungs. Only III, IV and VI aortic arches are present. With the partial separation of the ventricle into two parts, the distal portion of the conus arteriosus and the entire ventral aorta are split into three vessels, i.e., two aortic or systemic and one pulmonary.
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