Question

this long tube may be blocked by a urinary stone, causing blockage of urine flow and considerable pain. renal pyramid renal capsule ureter urethra

Explanation:

The ureter is the long - tube that can be blocked by a urinary stone, causing urine flow blockage and pain. The renal pyramid and renal capsule are parts of the kidney and not the long tube in question. The urethra is the tube through which urine exits the body, not the tube where the described blockage typically occurs first.

Answer:

Ureter