Which system was mentioned as crucial for automatic responses like riding a bike?

The limbic system plays a key role in emotions, memory, and certain aspects of behavior, but it is not primarily responsible for the automatic responses involved in motor skills like riding a bike.

The appropriate choice is the cerebellum, which is crucial for coordinating voluntary movements and maintaining balance and posture. It is responsible for the fine-tuning of motor activity and the development of procedural memory, which enables activities such as riding a bike to be performed automatically after practice. This means that the more someone rides a bike, the more these actions become ingrained and require less conscious thought, allowing for smooth and fluid motion.

The frontal lobe is associated with planning, decision-making, and controlling behavior while the temporal lobe primarily processes auditory information and is involved in memory storage. Therefore, these regions are not directly responsible for the automatic physical responses involved in tasks like riding a bike.