Which type of circulation is found in rat?

Open and double

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Open and single

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Closed and single

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Closed and double

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Solution

The correct option is D Closed and double
Like all other mammals, the heart lies in the thoracic cavity and consists of two auricles and two ventricles and valves are present and the blood circulates in the proper vascular system. So it is a closed type of circulatory system.
Rats exhibit double circulation. The oxygenated blood in the left chamber of the auricles of heart is separated from the venous blood contained in the right chamber and also the blood collected in the heart passes twice through it, once through the lungs pulmonary circulation and other through various systems of the body.
So, the correct answer is option D.

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