If our body is compared to a car engine Why can proteins be compared to the parts of the engine?

Proteins can be compared to the parts of a car engine because they serve as essential components that perform specific functions necessary for the engine's operation. Just as each part of an engine—like pistons, valves, and spark plugs—has a unique role in ensuring the vehicle runs smoothly, proteins have diverse structures and functions that contribute to processes like metabolism, repair, and immune response in the body. Additionally, both proteins and engine parts are crucial for overall performance and efficiency, highlighting their importance in maintaining system functionality.