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RBC

Which of the ...

Question

Which of the following is the respiratory pigment present in the stroma of an RBC?

A

Tunica externa (adventitia) - consists of smooth muscle tissue

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B

Tunica interna (intima) - consists of only a thin layer of connective tissue

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C

Tunica media - consists of simple squamous epithelium

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D

Tunica media - consists of smooth muscle and elastic connective tissue, the amounts and proportions of each depending on vessel type

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Solution

The correct option is C
Tunica media - consists of simple squamous epithelium

RBC has a colourless spongy body, also called stroma. Stroma contains haemoglobin (Hb), a respiratory pigment. Hb consists of an iron rich haem group and protein part called globin. It can combine easily with oxygen to form oxyhaemoglobin, which is an unstable compound. It reacts with carbon dioxide to form carbaminohaemoglobin.

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