Produce a sentence which has a cefr level of "a1" and keywords: case, involuntary, behaviour, example, pinprick.
In the case of involuntary behaviour associated, for example, with a pinprick, this would lead to a tension on just those filaments which open the appropriate valves in the walls of the ventricles to release the animal spirits into the motor nerves that contract the muscles for moving the limb away from the point of the indentation.