Final answer:
The ureter is the structure that connects the kidney to the bladder in the human excretory system.
Step-by-step explanation:
The part that connects the kidney to the bladder in the excretory system is the ureter. Each kidney is connected to a ureter, a tube that carries urine from the kidney to the urinary bladder. This is part of the urinary system which includes the kidneys, ureters, bladder, and urethra.
While the nephron is the functional unit of the kidney, the ureter performs the specific function of urine transport from the kidneys to the bladder for temporary storage before it is expelled from the body.