(i) The organ which produces urea.   (ii) The iron containing pigment in Erythrocytes.   (iii) The junction between two nerve cells.   (iv) The phase of the cardiac cycle in which the auricles contract.   (v) An apparatus to compare the rate of transpiration in cut shoots.   (vi) The pressure exerted by cell contents on a plant cell wall.   The fluid surrounding the developing embryo.   (viii) The outer part of the kidney containing the Bowman's capsules.