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Q. Assertion : Tetany is rapid spasm in muscle.
Reason : Tetany is usually caused by an increase in the blood calcium level.

Locomotion and Movement

Solution:

Tetany is a spasm and twitching of the muscles, particularly of face, hands and feet. Rapid spasms (wild contractions) in muscle is due to low $Ca^{2+}$ in body fluid which may be due to underactive parathyroid gland.