1 Describe in a simplied way the components and variables of

1. Describe in a simplied way, the components and variables of the physiological system involved in human walking in a specific direction.

2. Why is walking considered a closed-loop operation?

Solution

( a ) The major components involved in walking are the brain, eyes, and legs and feet. The input may be

chosen as the desired walk direction, and the output the actual walk direction. The control action is

determined by the eyes, which detect the difference between the input and output and send this

information to the brain. The brain commands the legs and feet to walk in the prescribed direction.

( b ) Walking is a closed-loop operation because the control action is a function of the output.