Muscle-relaxing drugs are administered to a patient during major surgery. Which of the two chemicals described next would be a good skeletal muscle relaxant and why? ■ Chemical A binds to and blocks...

Muscle-relaxing drugs are administered to a patient during major surgery. Which of the two chemicals described next would be a good skeletal muscle relaxant and why?

■ Chemical A binds to and blocks ACh receptors of muscle cells.

■ Chemical B floods the muscle cells’ cytoplasm with Ca²⁺.