When a muscle is stimulated, do all motor units fire? Why, or why not?
Not all motor units fire when a muscle is activated. This is because in the reflex, not all motor units are activated (Brown et al, 2006).
1b). Explain how the force of contraction changes with recruitment.
The force of contraction depends on the activation of muscle fibers. When more motor fibers are recruited, a greater contraction force results (Zatsiorsky & Kraemer, 2006). The stimulation of the smallest muscles such as the slow twitch fibers result from the recruitment of the smallest motor nerves which, occurs first (Zatsiorsky & Kraemer, 2006).
1c). with continues recruitment, is there a point at which there is ...
