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: -Blood flows from venules into larger veins. Just like the arterial system, three layers make up the vein walls. But unlike the arteries, the venous pressure is low. Veins are thin-walled and are less elastic.

Detailed explanation-3: -organs and parts are called venules, and they unite to form veins, which return the blood to the heart.

Detailed explanation-4: -The capillaries join up to form larger vessel which in turn forms veins The veins carry blood back to the heart The veins are under less pressure than the arteries.