Options are not provided in the question. Th equestion is as follows:
_________ the property of skeletal muscle whereby an increase in the frequency of action potentials enhances the force developed by the muscle cell?
a. length-tension relationship
b. force-velocity relationship
c. internal tension
d. external tension
e. summation
Answer: e. summation
Step-by-step explanation:
Summation is the property of skeletal muscle which occurs through continuous addition of signals or stimuli together that produces a stronger contraction in the muscles.
If the motor neurons are increased, it results increment in action potential and hence increases the amount of active motor units in a muscle, which is called recruitment.
Hence, the correct option is e. summation