A Normal, Healthy Animal Never Contracts the Flexor Muscles and the Extensor

question 216

Multiple Choice

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) They 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.

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