Answer
a. the artery wall is thicker
c. the artery lumen is smaller
Work Step by Step
The arteries have thicker walls and smaller radius than the veins. The arteries also have smaller lumen.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.