Circulatory System

Your heart is a small muscle, about the size of a human fist. But this amazing muscle works hard! An adult's heart contracts about 70 times each minute of every day, about 30 million times every year of his life! Your blood is amazing, too. It is a liquid tissue that carries nutrients and oxygen to all your body's cells and also fights off disease-causing germs. Blood has four main parts: plasma, red cells, white cells, and platelets. This circulatory system theme unit provides a variety of materials to help students learn about their amazing circulatory system. Puzzles and other provided materials boost spelling and literacy skills, too.