How does the heart send the blood through the body?—"Through pipes called arteries."
What do the arteries resemble in the way they are arranged?—"The branches of a tree."
What makes the blood impure?—"As the blood flows, it gives nourishment to every part of the body; this makes it poor. It also takes up the old worn-out particles; this makes it impure."
Where do the arteries carry the impure blood?—"To the veins."
Where do the veins carry the impure blood?—"To the heart."
Where does the heart carry the impure blood?—"To the lungs."
What happens to the impure blood in the lungs?—"It is made pure."
What makes it pure?—"Pure air."
Where do the lungs send the blood after it is made pure?—"Back to the heart."
Where does the heart send the pure blood?—"Throughout the body."