Due to the pumping action of the electron transport chain, protons have a high concentration in the and a low concentration in the

A series of complexes from electron donors to acceptors happen in an electron transport chain.  Due to the pumping action in the chain, protons result to having a high concentration in the intermembrane space yet a low concentration in the mitochondrial matrix.

cats appear to have glowing cat eyes because the back of their eyeballs includes a special reflective surface called the tapetum lucidum. this lets them see better during the night, giving them a much better vision.