A certain drug is known to block monovalent cation channels. This drug is used as a "muscle relaxer." Skeletal muscle relies on

Question

A certain drug is known to block monovalent cation channels. This drug is used as a "muscle relaxer." Skeletal muscle relies on monovalent cation channels for the generation of action potentials to trigger contraction, whereas smooth muscle cells have more "routes" available to trigger contraction. Blocking one route would not be sufficient to cause relaxation; hence, this drug would be more likely to be effective on skeletal muscle.Would it affect both smooth and skeletal muscles or only skeletal muscles? 
muscle contruction does not require monovalent cations to be triggered 
this drug would work equally on smooth and skeletal muscle. 
this drug would be more likely to be effective on skeletal muscle. 
this drug would be more likely to be effective on smooth muscle.

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