sentence: Blood going away from the heart is carried in arteries.
sentences_before: Blood is carried in blood vessels. These are arteries and veins. Blood going to the heart is carried in veins.
sentences_after: The main artery going out of the right ventricle is the 'pulmonary artery'. The main artery going out of the left ventricle is the 'aorta'.
concept_name: blood
headings: Heart Structure
categories: Basic English 850 words Anatomy of the cardiovascular system