Complex sentence: Passive flexion of elbow meets immediate resistance due to stretch reflex in the triceps muscle.Further stretch activates inverse stretchreflex.The resistance to flexion suddenly collapses, and the flexes.continued passive flexion stretches the muscle and the sequence may be repeated.
Split into simpler sentences: Passive flexion of elbow meets immediate resistance due to stretch reflex in the triceps muscle.Further stretch activates inverse stretch reflex. Continued passive flexion stretches the muscle and the sequence may be repeated.