Question

The arteries differ from veins in having:

• A. Arteries consist of three distinct layers, which are thin and collapsible whereas veins consist of three distinct layers, which are rigid, thicker and highly muscular.
• B. Veins consist of three distinct layers, which are thin and collapsible whereas arteries consist of three distinct layers, which are rigid, thicker and highly muscular.
• C. Veins consist of two distinct layers, which are thick and collapsible whereas arteries consist of three distinct layers, which are rigid, thicker and highly muscular.
• D. Arteries consist of two distinct layers, which are thin and muscular whereas veins consist of three distinct layers, which are rigid, thicker and highly vascular.

Answer 1

Answer: (B)

The pulmonary artery carries dark-red deoxygenated blood from the right ventricle to the lungs whereas Pulmonary vein carries bright-red oxygenated blood from the lungs to the left atrium of the heart. ​Veins consist of three distinct layers, which are thin and collapsible whereas arteries consist of three distinct layers, which are rigid, thicker and highly muscular.