Question

1. what procedure describes the external filtration of blood to remove toxic substances when kidneys fail?

neurodialysis
hemodialysis
urodialysis
renodialysis

Explanation:

The question asks for the procedure of external blood filtration to remove toxins when kidneys fail. Hemodialysis is the medical procedure that does this by filtering blood through a machine (dialyzer) to perform the kidney's function of waste removal. Other options are incorrect: Neurodialysis relates to the nervous system, Urodialysis is not a recognized term for this purpose, and Renodialysis is not the standard term for external kidney replacement therapy.

Answer:

B. Hemodialysis