Question

multiple choice question
on this cross - sectional diagram of vessels, the arrow is pointing to a(n)
vein
capillary
artery

Explanation:

Arteries have thicker, more muscular walls compared to veins and capillaries. In the cross - sectional diagram, the structure with a relatively thick wall being pointed at is characteristic of an artery. Capillaries are very thin - walled and veins have thinner walls than arteries.

Answer:

O artery