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Question

Which of the following is lined by squamous epithelium?

A
Tunica interna
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B
Endocardium
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C
Myocardium
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D
Both a and b are correct
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Solution

The correct option is D Both a and b are correct
Myocardium is the middle muscular layer of the heart which contracts to pump blood out of the heart and then relaxes as the heart refills with returning blood. It consists of the cardiac muscle fibres.
Endocardium is the innermost layer in contact with blood. It consists of the simple squamous epithelial cells.
The blood vessels consist of 3 layers- tunica interna (innermost layer), tunica media (middle layer) and tunica externa (external layer). Tunica interna is composed of simple squamous epithelial cells.

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