A normal, healthy animal never contracts the flexor muscles and the extensor muscles of the same leg at the same time. Why not?
A. When the interneuron sends excitatory messages to one, inhibitory messages go to the other.
B. Both muscles are mechanically connected in a way that makes it impossible for both to contract at the same time.
C. Such coordination is learned through prenatal movement.
D. Both muscles are controlled by branches of the same axon.
Answer: A
You might also like to view...
Horney proposed that neurotic needs are normal coping strategies so long as they do not become complexes
a. True b. False
Categories are:
a. groups of objects that provide the best exemplars of various concepts b. well defined groups of objects with no overlapping members c. lists of typical features that can be used to classify objects d. classes of objects that most people agree belong together
The variance in a one factor between groups experiment is divided into the variance _____ groups
a. above and below c. related to and independent of b. between and within d. outside and inside
Which of the following facelike drawings is newborn Rori most likely to prefer?
A) one with the features arranged upright B) one with the features arranged upside down C) one with the features arranged sideways D) one with eyes closed and no mouth