sentence: Venules are the smallest veins.
sentences_before: On the other end of the capillary, it turns into a venule.
sentences_after: Veins take blood back to the heart. As veins go back to the heart, they get bigger. The biggest systemic veins in the body are the vena cava. There are two vena cava. The 'inferior vena cava' takes blood from the lower part of the body to the right side of the heart.
concept_name: venule
headings: Circulatory system Systemic circulation
categories: Cardiovascular system