What action is described by the sliding-filament theory?
a. the stimulation of the muscle contraction by the sarcoplasmic reticulum
b. the action of the actin filament sliding across the myosin to shorten the fiber and generate force
c. the process of skeletal muscles moving the limbs
d. the rate of twitching within the myofiber
Answer: b. the action of the actin filament sliding across the myosin to shorten the fiber and generate force
The sliding-filament sliding across the myosin to shorten the fiber and generate force. This interaction is what produces the twitch within the muscle and thus the rate at which the twitches occur.