Final answer:
H+ reenters the channel and opens a door for the stuck material to pass through the cell. This process is called chemiosmosis and it generates ATP for the cell's energy needs.
Step-by-step explanation:
H+ reenters the channel and opens a door for the stuck material to pass through the cell. In biological terms, this process is called chemiosmosis. Chemiosmosis is the movement of ions across a selectively permeable membrane, down their electrochemical gradient. In this case, the H+ ions move from an area of high concentration to an area of low concentration through a semi-permeable structure called the ATP synthase. This movement of ions allows for the generation of ATP.