Hey Ubiquinone! These are the two ice cream cones that need to go to Cytochrome B-C1. Can you deliver it to her for me?
NADH Dehydrogenase received two ice cream cones (protons) from NADH. At the same time, she gave away two hamburgers that she was holding.
Here are the two ice cream cones that you asked for.
As Cytochrome B-C1 receives her ice cream (electron) , she leaves her hamburger (proton/ hydrogen ion) in the cafeteria.
Hey Cytochrome C! Can you give this to Cytochrome Oxidase please?
Cytochrome B-C1 has given the ice cream to Cytochrome C. However, Cytochrome C only has enough hands to bring one ice cream at a time to Cytochrome Oxidase
Cytochrome C gives Cytochrome Oxidase the ice cream one by one. But, Cytochrome Oxidase needs 4 ice creams total to in order to be happy. So, the entire cycle starts again.
Now, Cytochrome Oxidase has 4 ice cream cones (electrons), 8 burgers (protons), and two hotdogs (oxygen molecules). He trades in his hotdogs and 4 burgers for 2 sandwiches (H2O molecules). Then he leaves them on the cafeteria table for ATP Synthase to take.