Human Heart Diagram with Chambers and Blood Vessels

A large line drawing of a human heart shown from the front, with the inside of the lower chambers visible. The thick outer wall curves around the right side and down to a pointed bottom tip. A diagonal wall runs through the lower part, splitting the chambers. Valve flaps with scalloped edges sit in the middle of the heart. A tall tube rises on the left, and a curved arch at the top has three branches. Another wide tube extends to the right across the top, and a long vessel runs down the lower left. Try coloring the blood vessels blue and red to show which carry blood to and from the heart, then use a third color for the valves. It is a handy printable for a science unit on the circulatory system, and the big open spaces are easy for small hands to fill in.