Memory Game Circulatory Story VocabularyOnline version In this game, you will have to match the word to its definition. These word are from the our story, The Circulatory Story. by Whitney Gurrola To carry something one place to another. Transport Component Circulatory The smallest, functioning unit of a living organism. Hemoglobin Pericardium Cell A protective sac that encloses the heart. A protein found in red blood cells that transport, or carries oxygen. Related to the circulation of blood. A part of a larger object or system Plasma The liquid part of blood; 90% of plasma is water.