Which device filters blood to remove excess water and waste when kidneys fail?

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Study for the AAMI Certified Associate in Biomedical Technology Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which device filters blood to remove excess water and waste when kidneys fail?

Explanation:
When kidneys fail, a dialysis machine acts as an artificial kidney to cleanse the blood and remove excess fluid. Blood is circulated through a dialyzer, which contains a semipermeable membrane. On one side is the blood; on the other side is a dialysate solution. Waste products like urea and excess salts diffuse across the membrane into the dialysate, while ultrafiltration uses pressure to pull extra water out. The cleaned blood is then returned to the body. The other devices listed are for delivering fluids or nutrition and do not filter blood.

When kidneys fail, a dialysis machine acts as an artificial kidney to cleanse the blood and remove excess fluid. Blood is circulated through a dialyzer, which contains a semipermeable membrane. On one side is the blood; on the other side is a dialysate solution. Waste products like urea and excess salts diffuse across the membrane into the dialysate, while ultrafiltration uses pressure to pull extra water out. The cleaned blood is then returned to the body. The other devices listed are for delivering fluids or nutrition and do not filter blood.

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