Which of the following are located in tunica media of human blood vessels?

Collagen fibres and smooth muscle

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Squamous epithelium and striated muscle

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Yellow fibres and smooth muscle

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Yellow fibres and striated muscle

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Solution

The correct option is C Yellow fibres and smooth muscle
Tunica media is the middle, thickest layer of blood vessels and is made up of yellow (elastin) fibres and involuntary or unstriped or smooth muscle fibres. Tunica externa is rich in collagen fibres but has less elastin fibres, while tunica interna is made up of a single layer of simple squamous epithelial cells (endothelium) and yellow elastin fibres. Thus the correct answer is option C.

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