Biology - Human Body Systems - Circulatory system - Double Circulation Explained
5 steps. Step 1: 'THE HEART - A muscular pump with 4 chambers. Right side pumps to lungs. Left side pumps to body. Left ventricle has the thickest walls (pumps furthest!).' Show labeled heart diagram. Step 2: 'PULMONARY CIRCULATION - Right ventricle → Pulmonary artery → Lungs (blood picks up O2, dro