Summation

How does the duration of the contraction phase compare to the duration of the relaxation phase?

Contraction phase is shorter than relaxation phase.

Why didn’t finger twitches occur at stimuli prior to that level of stimulus?

The strength of input was not strong enough to give a response.

Above the maximal stimulus, the amplitude of the response no longer increases. Why?

All muscle cells are contraction.

What is summation?

Is when stimulus increases continually till it leads to unfused tetanus.

What is tetanus?

Is a complete or full sustained contraction.

What is unfused tetanus?

is when a muscle is stimulated repeatedly, but the twitches only partly build on each other.

What is fused tetanus?

is when the muscle is stimulated so fast that it has no time to relax at all between twitches.

Why did different muscle lengths produce different tensions?

The overlap in muscle proteins lead to different tensions at different muscle lengths