Webquizzes on the cardiovascular system. The body's circulatory system includes the cardiovascular and lymphatic systems; The quizzes below focus on the cardiovascular. Webthe main organ in the circulatory system is the _______________. The heart is about the size of your ___________. The kind of muscle your heart is made of is ___________. The heart's two upper chambers are called _________. Controls the steady circulation of the blood through the body by means of the heart and blood vessels. Weboct 30, 2023 · in this worksheet we’ll be focusing on the…