A Portion of the Systemic Circulation
A portion of the systemic circulation. 1, A branch of the aorta. This terminates in the capillaries (2, 3). 2, A vein through which the impure blood is carried to the right side of the heart.
Cutter, Calvin First Book on Analytic Anatomy, Physiology and Hygiene, Human and Comparative (Philadelphia: J. B. Lippincott & Co., 1875) 119