Kidneys and Metals Problem Set

Problem 7: Membranes and metals

Amino acids are filtered out of the blood in the glomerulus of the kidney, but amino acids are not a waste product. The body needs the amino acids, so they are reabsorbed from the filtrate back into the tubule cells of the kidney. After the amino acids are concentrated in the tubule cells they must be transported back into blood. What type of transport is used to move the amino acids from the filtrate to the inside of the kidney cells?

A.	passive diffusion
B.	protein channels
C.	active transport