Question

What response is found by increasing the intensity to a point that achieves a slight muscle twitch, then decreasing the intensity by 10% (90% of motor threshold)?

a. Subsensory
b. Sensory
c. Motor twitch
d. Motor tetany

Answer 1

The correct response is 'a. Subsensory', indicating a stimulus level that is below the sensory threshold and would not result in a noticeable muscle twitch or contraction after increasing to a muscle twitch and decreasing intensity by 10%.

Step-by-step explanation:

The question revolves around the concept of neuromuscular physiology, particularly the response of skeletal muscle to stimulation by motor neurons. It asks what happens when the intensity of stimulation is increased to achieve a slight muscle twitch, and is then decreased by 10%. The most appropriate response would be a reduction in the strength of the muscle twitch, which is not sufficient to cause a sustained contraction, also known as tetanus. Therefore, the correct answer to this question is 'a. Subsensory'. This response implies a stimulus that is below the sensory threshold and would not cause a detectable muscle twitch or contraction.