Question

The excitatory effect on skeletal muscles is produced by .......... salts.

• A. Na
• B. Mn
• C. Ca
• D. Mg

Answer 1

Answer: (A)

Na

Action potentials in skeletal muscle cells are due to ionic mechanisms. There is a voltage-dependent change in $N{a}^{+}$ permeability, followed by a delayed increase in $K^{+}$ permeability.