Kidney Kidney The kidneys are two bean-shaped organs found in vertebrates. They are located on the left and right in the retroperitoneal space, and in adult humans are about in length. They receive blood from the paired renal arteries; blood exits into the paired renal veins. Each kidney is attached to a ureter, a tube that carries excreted urine to the bladder. The nephron is the structural and functional unit of the kidney. Each adult kidney contains around 1 million nephrons. The nephron utilizes four processes to alter the blood plasma which flows to it: filtration, reabsorption, secretion, and excretion. The
Bladder pipe Bladder pipe The Bladder pipe ("German": Platerspiel or Blaterpfeife) is a medieval simplified bagpipe, consisting of an insufflation tube (blow pipe), a bladder (bag) and a chanter; sounded by a double reed, which is fitted into a reed seat at the top of the chanter. The reed, inside the inflated bladder, is sounded continuously, and cannot be tongued. Some bladder pipes were made with a single drone pipe, and reproductions are similar to a loud, continuous crumhorn. The chanter has an outside tenon, at the top, near the reed, which fits into a socket or stock, which is then tied