If it is false, change the underlined word so that the statement reads true. Urea is formed when carbohydrates are digested. Flame cells function to heat up body fluids. In the earthworm body, each segment has its own pair of nephridia. Urine is carried to the bladder in the ureter.
Urination is under voluntary control of the external sphincter.
An adult bladder can hold 0.5L of urine. Within the kidney, nephrons may extend into the renal medulla. Filtration in the glomerulus occurs because of a difference in diameter between the arterioles bringing blood in and the arterioles taking blood out. Tubular reabsorption occurs in the distal tubule . During tubular secretion, wastes that are actively secreted into the tubule may include drugs.