Question

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which of the following propels urine from the kidney through the ureter to the bladder?
peristalsis
pressure from the abdomen
contraction of the kidney
gravity

Explanation:

Peristalsis is the wave - like muscle contractions that move substances through tubes in the body. In the urinary system, peristalsis in the ureter propels urine from the kidney to the bladder. Pressure from the abdomen is not the main mechanism for urine movement in the ureter. The kidney's main function is filtration, not contraction to move urine through the ureter. Gravity has a minimal role compared to peristalsis in the ureter (as the ureter is not a simple vertical tube relying mainly on gravity).

Answer:

Peristalsis