Ureters are which of the following?

• A. The tube that stores urine until bladder contraction
• B. A muscular tube extending from kidney to bladder, 10-12 inches long, lined with mucous membrane
• C. The opening from the bladder to the urethra
• D. The network of capillaries in the glomerulus

Answer: (B)

Ureters are muscular tubes that move urine from the kidneys to the bladder. They’re about 10–12 inches long and are lined with a mucous membrane. The walls contain smooth muscle that produces peristaltic waves to push urine downward, and they travel retroperitoneally from the renal pelvis to penetrate the bladder’s posterior wall at an oblique angle to help prevent backflow.

This differs from the bladder, which stores urine until you void. It also isn’t the urethra, which is the opening from the bladder to the outside world. And it isn’t the glomerulus, a network of capillaries in the kidney where urine formation begins.