It opens into right auricle in frog heart Coronary sinus _______________.

Drains impure blood from pulmonary veins to left auricle

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Receives impure blood from heart musculature via coronary veins

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Drains pure blood in right auricle

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More than one options are correct

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Solution

The correct option is B Receives impure blood from heart musculature via coronary veins
B. Receives impure blood from heart musculature via coronary veins
EXPLANATION: Frogs have closed circulatory system. This system uses the pulmonary circulation and systemic circulation. The frog heart has three chambers. The anterior broader part is called auricles and the posterior part is called ventricle. Auricles are two chambered: right auricle and left auricle. Ventricle is single chambered. Coronary vein is a collection of veins joined together to form a large vessel. This large vessel collects blood from the heart muscle. Heart muscle is also called as myocardium. Coronary vein delivers impure blood or less-oxygenated blood to the right atrium.

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