Limb Movement Is Controlled by Sets of Antagonistic Muscles Called

question 151

Multiple Choice

Limb movement is controlled by sets of antagonistic muscles called flexors and extensors that work against one another.A sensory input to the motor neurons of these muscles will cause opposite effects.Why is this?

• A) The information is summed so that the flexor will contract first.
• B) A monosynaptic spinal reflex will prevent one or the other muscle from contracting.
• C) Interneurons are not part of the circuit.
• D) When a muscle is stimulated to contract, an interneuron applies an inhibitory stimulus to the antagonistic muscle.
• E) Information is transmitted to the brain, which decides which muscle is to contract.

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