Home Chemistry NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 13 PCB Read the following four statements (A-D) rel…
Chemistry NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 13 PCB Single Correct MCQ
Published on: August 13, 2026

Read the following four statements (A-D) related to the structure and function of blood vessels and identify how many of them are correct.

A
All arteries and veins have three distinct layers: tunica intima, tunica media, and tunica externa.
Only one statement is correct
B
The tunica intima is composed of columnar epithelium that allows active transport across the vessel wall.
Two statements are correct
C
The tunica media is generally thicker in arteries than in veins due to the presence of more smooth muscle and elastic fibres.
Three statements are correct
D
The tunica externa is the external layer of fibrous connective tissues with collagen fibres, present in both arteries and veins.
All four statements are correct

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Text Solution

Verified by Experts
The correct answer is:
C

Both arteries and veins are made up of three layers: tunica intima (squamous endothelium), tunica media (smooth muscle + elastic fibres), and tunica externa (fibrous tissue with collagen).
The tunica intima is made of simple squamous endothelium, not columnar. Also, it allows passive diffusion, not active transport.

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