Excretory System of Man: The excretory system of man consists of a pair of kidneys, a pair of ureters, a urinary bladder, and a urethra. Kidneys: Appearance and Position: The kidneys are dark red, a bean-shaped organ about 10-13 cm long, 5-6 cm in breadth and 3-4 cm wide, weighing about 150-170 gm in adult male and 135-145 gm in the female. They are placed against the back wall of the abdominal cavity, below the diaphragm. The lower two pairs of ribs protect them and they are covered by Peritoneum on the ventral side only. The left kidney is slightly … Continue reading Excretory System of Man