While waiting for a signal to contract, a muscle cell membrane maintains a slightly higher positive charge on the outside only because sodium-potassium ATPase pumps are available to generate this difference.
Only because sodium-potassium ATPase pumps are available to provide this difference, a muscle cell membrane maintains a marginally higher positive charge on the outside while waiting for a signal to contract.
To produce an action potential, these sodium pumps can transfer sodium ions across a cell's membrane. The body's muscles can then contract as a result of electrical signals travelling through it.
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