Chapter 47 - Musculoskeletal Systems - 47.2 - Many Factors Affect Muscle Performance - 47.2 Recap - Learning Outcomes - Page 1014: 1

The strength of a muscle contraction depends both on the number of muscle fibers involved and the rate of contraction. Though a single action potential initiates a single twitch, rapidly fired action potentials can build up tension in the fiber and release the stroke in one motion. Because of this, an animal can demonstrate a graded response to increased stimulation from a motor neuron.

The strength of a muscle contraction depends both on the number of muscle fibers involved and the rate of contraction. Though a single action potential initiates a single twitch, rapidly fired action potentials can build up tension in the fiber and release the stroke in one motion. Because of this, an animal can demonstrate a graded response to increased stimulation from a motor neuron.