The all-or-nothing principle says that muscles always contract with the same force.

Name: The all-or-nothing principle says that muscles always contract with the same force.
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The all-or-nothing principle states that a muscle fiber will contract fully or not at all in response to a stimulus that reaches the threshold, but it does not mean that all muscle fibers contract with the same force. The force of a muscle contraction can vary depending on the number of fibers activated.

The All-Or-Nothing Principle Says That Muscles Always Contract with the Same