GENERAL HISTOLOGY

Detailed explanation-1: -A tetanic contraction (also called tetanized state, tetanus, or physiologic tetanus, the latter to differentiate from the disease called tetanus) is a sustained muscle contraction evoked when the motor nerve that innervates a skeletal muscle emits action potentials at a very high rate.

Detailed explanation-2: -Therefore, hyposecretion of parathyroid hormone decreases the blood calcium level due to its increased excretion in urine. It causes increased excitability of muscles and their sustained contraction referred to as parathyroid tetany.

Detailed explanation-3: -If many stimuli are given repeatedly and rapidly to the muscle fibre, the result is an amplified, sustained contraction called as tetanus.