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

question 64

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) 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.

Understand the different types of child care arrangements and their characteristics.

Comprehend how economic factors influence parenting and child development.

Recognize the effects of parental stress on child-rearing practices.

Identify the health risks and benefits of non-home childcare settings.

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