Final answer:
A high frequency of muscle stimulation leads to wave summation, where muscle twitches overlap due to a lack of full relaxation between twitches, and can result in a state of continuous contraction known as tetanus.option a is correct
Step-by-step explanation:
When the frequency of stimulation of a muscle is great enough, wave summation results and muscle twitches overlap. This phenomenon occurs because subsequent action potentials fire before the muscle has had the chance to fully relax from the previous twitch. This leads to a higher concentration of calcium ions in the sarcoplasm as they are not fully reabsorbed into the sarcoplasmic reticulum between twitches.
The excitation-contraction coupling effects of successive motor neuron signaling are added together, which is known as wave summation. If the frequency of the stimuli is high enough to cause muscle twitches to occur one after the other without any relaxation in between, this state is referred to as complete tetanus. At lower frequencies that still exceed a single twitch but allow very brief relaxation periods, the muscle experiences incomplete tetanus.
Wave summation and the degree of tension in a muscle are therefore dependent on the frequency of motor neuron stimulation. If this frequency is high, it can lead to continuous muscle contraction without relaxation, also known as tetanus.