When You Step on a Sharp Tack and Pull Your

question 28

Multiple Choice

When you step on a sharp tack and pull your foot away, this movement involves all of the following except

• A) the contraction of one set of leg muscles and the relaxation of an antagonistic set of muscles.
• B) a polysynaptic spinal reflex.
• C) interneurons between sensory and motor neurons in the spinal cord.
• D) sensory neurons that synapse directly with motor neurons in the spinal cord.
• E) motor input through the dorsal root that synapses with interneurons in the spinal cord.

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