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 A protective sac that encloses the heart. Cell Transport The smallest, functioning unit of a living organism. To carry something one place to another. The liquid part of blood; 90% of plasma is water. Plasma Pericardium Component Related to the circulation of blood. Hemoglobin A protein found in red blood cells that transport, or carries oxygen. A part of a larger object or system Circulatory