Class 11 · Body Fluids and Circulation

Structure of Blood Vessels — NEET Biology

📚 Practice Concept
📖 NCERT Source

The blood flows strictly by a fixed route through Blood Vessels—the arteries and veins. Basically, each artery and vein consists of three layers: an inner lining of squamous endothelium, the tunica intima, a middle layer of smooth muscle and elastic fibres, the tunica media, and an external layer of fibrous connective tissue with collagen fibres, the tunica externa. The tunica media is comparatively thin in the veins.

NCERT Biology · Class 11 · Chapter 15 · Paragraph 33
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QuestionPractice Question

Which layer is NOT part of the blood vessel walls?

📖 Solution & NCERT Explanation
View solution & NCERT explanation

Correct answer: D Tunica cordis

Blood vessels are composed of three layers: intima, media, and externa — no tunica cordis exists.

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What does NCERT say about blood flows strictly by?
The blood flows strictly by a fixed route through Blood Vessels—the arteries and veins. Basically, each artery and vein consists of three layers: an inner lining of squamous endothelium, the tunica intima, a middle layer of smooth muscle and elastic fibres, the tunica media, and an external layer of fibrous connective tissue with collagen fibres, the tunica externa.
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Which chapter is this from?
Body Fluids and Circulation, Class 11 NCERT Biology.

Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.

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