tubule - a small tube

malpighian body, malpighian corpuscle, renal corpuscle - the capsule that contains Bowman's capsule and a glomerulus at the expanded end of a nephron

kidney - either of two bean-shaped excretory organs that filter wastes (especially urea) from the blood and excrete them and water in urine; urine passes out of the kidney through ureters to the bladder