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Which of the following blood constituent is in the form of a bi-concave disc?

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Which of the following blood constituent is in the form of a bi-concave disc?

(a) lymphocytes

(b) leucocutes

(c) neutrophils

(d) erythrocytes

I got this question in an internship interview.

My question is from Other Biomedical Recorders topic in section Biomedical Recorders of Biomedical Instrumentation

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Correct option is (d) erythrocytes

Explanation: Red blood cells have the form of a bi-concave disc with a mean diameter of about 7.5 m and thickness of about 1.7 m. The mean surface area of the cell is about 134mm^2. There are about 5.5 million of them in every cubic millimetre of blood in men and nearly 5 million in women.

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