PATHOLOGY

Detailed explanation-1: -Veins carry blood toward the heart. After blood passes through the capillaries, it enters the smallest veins, called venules. From the venules, it flows into progressively larger and larger veins until it reaches the heart.

Detailed explanation-2: -Veins are blood vessels that carry blood toward the heart. The blood in the veins is under considerably less pressure than that in the arteries. The veins have thinner walls with less smooth muscle and relatively larger lumens. They are less elastic than arteries, as they contain less elastic fiber.

Detailed explanation-3: -The arteries (red) carry oxygen and nutrients away from your heart, to your body’s tissues. The veins (blue) take oxygen-poor blood back to the heart. Arteries begin with the aorta, the large artery leaving the heart. They carry oxygen-rich blood away from the heart to all of the body’s tissues.