effects of repeated stimulation

Summation: Repeated stimuli before complete relaxation → stronger contraction.

Incomplete Tetanus: Muscle partially relaxes between contractions but still builds tension.

Complete Tetanus: No relaxation; maximum tension reached.

Recruitment: More motor units activated, increasing tension in sustained contractions.

Muscle Tone: Some motor units are always active, keeping muscles firm even at rest.

Atrophy: Lack of stimulation leads to muscle weakness and shrinkage.