What is the outermost layer of an artery's wall called?Multiple choice question.tunica externatunica mediatunica internaendothelium

Breakdown the Problem

We need to identify the correct term for the outermost layer of an artery's wall from the provided multiple-choice options.

Relevant Concepts

The layers of blood vessels, including arteries, comprise three main layers:

1. Tunica externa (or adventitia) - the outer layer.
2. Tunica media - the middle layer.
3. Tunica interna (or intima) - the inner layer, which includes the endothelium.

Analysis

• Tunica extern: This is indeed the outermost layer of the artery.
• Tunica media: This is the middle layer of smooth muscle and elastic tissue.
• Tunica interna: This is the innermost layer that contacts the blood.
• Endothelium: This refers specifically to the tissue that lines the blood vessels but does not represent a separate layer.

Verify and Summarize

Thus, among the options given, the term that identifies the outermost layer of an artery is tunica externa.

Final Answer

The outermost layer of an artery's wall is called the tunica externa.