i put mineral salts for the kidney Q (excess are not
reabsorbed)
RBC can pass through capillaries by changing their shapes to
bell-shaped
Hence, I put protein and RBC (too big to filter out, components of
blood)
the possible genotypes are I^B I^O, I^B I^B, I^A I^B
Salts (namely sodium ions) are reabsorbed. I think they were
talking about if RBCs can pass through walls of capillaries
haha.