The portal has been deactivated. Please contact your portal admin.

Question Video: Understanding the Importance of Concentration Gradients in Dialysis Biology

The presence of a concentration gradient for urea is crucial for successful blood purification using an artificial kidney (dialysis). To which of the following does that also apply? [A] Glucose [B] Amino acids [C] Glycogen [D] None of the answers are correct

02:08

Video Transcript

The presence of a concentration gradient for urea is crucial for successful blood purification using an artificial kidney, or dialysis. To which of the following does that also apply? (A) Glucose, (B) amino acids, (C) glycogen, or (D) none of the answers are correct.

This question is asking us about the process of dialysis. Dialysis is used when a patient has kidney failure. This means that their kidneys have stopped functioning properly. The kidneys are a pair of organs that are primarily responsible for filtering wastes from the blood. Dialysis replaces the function of the kidneys by removing wastes from the blood. The blood is pumped out of the patient and through a network of semipermeable tubing. Semipermeable means that some molecules can pass through and others cannot.

You may recall that molecules move down their concentration gradient from areas of high concentration to areas of low concentration. There is no waste in the dialysis fluid, and there is some waste in the blood. So, the waste moves from the blood and into the dialysis fluid. The dialysis fluid carries it away. This is how the process of dialysis removes waste from the bloodstream.

Urea is a type of metabolic waste generated by the metabolism of proteins. It is one of the waste materials removed from the blood by kidney dialysis. The correct answer choice would be another type of waste that needs to be removed from the bloodstream.

Let’s look at our choices. Glucose is a molecule that is used to generate cellular energy. It is not a waste product. Amino acids are the building blocks of proteins. They are not a waste product. Glycogen is a macromolecule used for the storage of glucose, which our cells need. It is not a waste product. That means that the correct response is “None of the answers are correct.”

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.