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