- If a muscle is stimulated by a number of stimuli, the muscle fibre would not relax completely and the following twitches would produce a higher tension than the first one.
- This occurs through a process of summation
- As the frequency of the stimuli increase, the time of relaxation decreases. The result is an almost continous conttraction. This is called incomplete tetanus.
- When the the contraction is continous it is called complete tetanus.
