Anatomy & Physiology Circulatory #17

Question

Which artery layer is where the flow of blood occurs?

Answers

  1. Tunica media
    • Rationale:

      The tunica media is the middle layer of the artery; however, it is not the layer where blood flow occurs.

  2. Tunica intima
    • Rationale:

      The tunica intima is the innermost layer of the artery. It is the layer where blood flow occurs.

  3. Tunica externa
    • Rationale:

      The tunica externa is the outermost layer of the artery; however, it is not the layer where blood flow occurs.

  4. Tunica adventitia
    • Rationale:

      The tunica adventitia is another term for the tunica externa, the outermost layer of the artery. It is not the layer where blood flow occurs.

Overview

An artery is defined as any of the muscular-walled tubes that form part of the circulation system.

Explanation

Learning Outcomes

Arteries are the structures by which blood (mainly that which has been oxygenated) is transported from the heart to all parts of the body. Each artery has three layers, the tunica intima, the tunica media, and the tunica externa (i.e., tunica adventitia). It is the tunica intima, the innermost layer of the artery, that blood flow occurs.

Test Taking Tip

Remember that the innermost layer of the artery is where blood flow occurs.

Video Rationale