Submitted by admin on Sun, 04/27/2014 - 11:53
definition:
Done without will or conscious control;(Especially of muscles or nerves) concerned in bodily processes that are not under the control of the will
sentence:
The involuntary muscles are controlled by structures deep within the brain and the upper part of the spinal cord called the brain stem.
difficulty:
medium
toefl frequency:
2
toefl classification: