A single nerve zap gives a quick twitch. Fire them faster and the twitches pile up. They make a smooth, strong pull that lasts. Pick a pattern of zaps and watch the tension.
Single twitch
Muscle tensionstimulate faster → more force
💡 The body also gets more force by recruitment. That means turning on more (and bigger) motor units. A motor unit = one motor neuron + every muscle fiber it controls.
📷 Reference image
A real labeled figure to compare with the interactive above.
Motor Units & Tension — OpenStax, CC BY 4.0 (via Wikimedia Commons)
