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Question

Which of the following animal has enucleated erythrocytes?

A
Earthworm
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B
Sepia
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C
Frog
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D
Rat
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Solution

The correct option is D Rat
Rat is a mammal. The circular mammalian erythrocyte is synthesized in the bone marrow. After synthesis, it undergoes a process called enucleation in which the nucleus is removed. The absence of a nucleus allows the red blood cells to contain more hemoglobin and hence all their internal space is available for oxygen transport in order to the body tissues. Thus the correct answer is option D.

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