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