41. These glands are lobed containing many secretory tubules which radiate outward from the excretory canal at the center. 42. The white colour in the butterfly family Pieridae is a derivative of uric acid, an excretory product. 43. The buttocks are often taboo due to their proximity to the anus and association with the excretory system. 44. In almost every segment is a pair of excretory organs called nephridia, which are derived from coelom tissue. 45. Starfish have no distinct excretory organs; waste ammonia is removed by diffusion through the tube feet and papulae. 46. However, in the other areas, spines are equally distributed except for the vicinity of the excretory pore. 47. The male vent ( excretory and reproductive opening ) area has an enlarged anatomy and papillae ( pictured ). 48. In addition " P . noctiluca " also lacks a gaseous exchange, excretory and circulatory system. 49. Indecent material includes explicit sexual material, four-letter words and explicit descriptions of sexual activity or excretory functions. 50. No direct connection exists between the pharynx and the excretory canal, which functions in the release of liquid urine.
