Question

Mrs. Lee asks her class to name a fact about the tunica intima. Which student has the BEST response?
A. Debbie says, "It is a thin layer of the blood vessel that helps blood flow smoothly."
B. Nate says, "It is thick and tough to handle large changes in blood pressure."
C. Troy says, "It is the outer layer of a blood vessel that helps anchor the vessel in place."
D. Noor says, "It is made of connective tissue and helps to protect the blood vessel."

Answer 1

A. Debbie.

The tunica intima (tunica interna) is the innermost, thin endothelial lining of a blood vessel that provides a smooth surface for blood flow. The other answers describe the tunica media (thick, handles pressure) and tunica externa/adventitia (connective tissue, anchors/protects).