Begegnungen mit der Natur 5, Arbeitsheft

34 Organsysteme des Stoffwechsels How about using English – the circulatory system Schulbuch Seite 130–131 O 1. Colour the figure. Mark oxygenated blood in red and blood low in oxygen blue. Additionally, mark the direction of the blood flow. 2. Complete the text. The heart has chambers. They are called right atrium, right ventricle, and . Blood from the body (blood very low in oxygen) enters the and goes to the . Blood from the lungs (blood with plenty of oxygen) enters the . 3. Answer the following questions. Does blood circulate back to the heart in veins or in arteries? Which parts of the heart pump blood into the arteries? In which of the heart’s chambers does the pulmonary vein trans- port oxygenated blood from the lungs? The heart contains valves between the atria and the ventricles (the tricuspid valve in the right side and the bicuspid valve in the left side), and between the ventricles and the arteries (pocket valves). Which valves are open and which ones are closed when the atria are pumping? Which valves are open and which ones are closed when the ventricles are pumping? pulmonary artery pulmonary vein ventricle aorta vena cava atrium lung Nur zu Prüfzwecken – Eigentum des Verlags öbv