Answer :
Final answer:
In a normally operating engine, valve springs are responsible for closing the intake and exhaust valves after they have been opened by a cam.
Explanation:
In a normally operating engine, intake and exhaust valves are closed by valve springs. These springs push the valves back into their closed position after they have been opened by a cam. The cam is responsible for opening the valves, while the valve springs provide the necessary force to close them. Other components like lifters/tappets, rocker arms or cam followers, and valve guides and/or pushrods are part of the valve train system and assist in the opening and closing actions of the valves.
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