Question

name the circular disc shaped biconcave blood cells without nuclei​

Answer 1

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HERE IS YOUR ANSWER:

Red blood cells have adaptations that make them suitable for this: they contain haemoglobin - a red protein that combines with oxygen. they have no nucleus so they can contain more haemoglobin. ... they have a biconcave shape (flattened disc shape) to maximise their surface area for oxygen absorption.

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Answer 2

Erythrocytes are in the shape of a biconcave disc.