occur because repetitive stimulation results in more muscle fibres being activated to contract.

occur when the muscle is stimulated so rapidly that the action potential is not allowed enough time to return to the resting potential.

generate more force than twitch contractions because with repetitive stimulation calcium stays in the cytoplasm for longer and the cross-bridges have more time to exert their full force.

generate more force than twitch contractions because repetitive stimulation results in a build-up in the amplitude of the muscle action potentials.