Question

question 173
0.25 pts
figure 20.1
use the diagram above to answer the following questions.
identify the letter that indicates the layer common to all blood vessels regardless of their size.
a
b
c
d
e

Explanation:

To determine the layer common to all blood vessels (arteries, veins, capillaries), we recall: All blood vessels have a tunica intima (innermost layer). In the diagram, label B corresponds to the tunica intima (endothelium - lined layer), which is present in all blood vessels (arteries, veins, capillaries) regardless of size. Other layers (tunica media, tunica externa) vary or are absent in some (e.g., capillaries lack tunica media/externa in full form), but tunica intima (B) is universal.

Answer:

B