A graded response occurs when
A)multiple motor units are activated.
B)an individual muscle cell undergoes an all-or-none response.
C)multiple muscles in a group are activated.
D)none of these choices are correct

Question

Quizplus · Accepted Answer

A graded response occurs when multiple motor units are activated. This leads to a variation in the strength of the muscle contraction, as more or fewer motor units are recruited depending on the intensity of the stimulus. In contrast, an individual muscle cell undergoes an all-or-none response, meaning that it either fully contracts or does not contract at all. Multiple muscles in a group can also be activated, but this is not necessarily a graded response as individual muscles may still be contracting in an all-or-none fashion.

A Graded Response Occurs When