In closed circulatory system, the respiratory pigment is

Left auricle to left ventricle during auricular systole.

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Right auricle to right ventricle during ventricular diastole.

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Right ventricle to aorta during ventricular systole.

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Pulmonary vein to left auricle during auricular systole.

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Solution

The correct option is B Right auricle to right ventricle during ventricular diastole.
Humans and other vertebrates have closed circulatory system and they have the respiratory pigment haemoglobin that increases the oxygen-carrying capacity of the blood.
Invertebrates which have an open circulatory system have pigments such as haemocyanin, haemerythrin and chlorocruorin.

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