Botox injections smooth facial wrinkles because is an ach antagonist that blocks the underlying facial muscles.

The correct answer would be - botulinum.

Explanation:

Botox is the cosmetic care for preventing or removal of facial wrinkles or in muscular conditions treatment. Botulinum is a neurotoxin obtained from the C. botulinum that is used in Botox. This neurotoxin is a powerful toxin however it is used in very small concentrations in clinical or cosmetical procedures.

Botulinum behaves as the acetylcholine antagonist which blocks the release of Ach neurotransmitter at the neuromuscular junction. This result in blocking the signaling between facial muscles and motor neurons.

Thus, the correct answer is - Botulinum.

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