The Excitatory Command to Contract the Biceps Muscle of the Arm

question 36

Multiple Choice

The excitatory command to contract the biceps muscle of the arm is normally accompanied by an inhibitory command to relax the antagonist triceps muscle. If this inhibitory signal failed to occur,

• A)the passive stretching of the triceps would trigger a stretch reflex that would return the arm to its original position.
• B)the contraction of the biceps would be irreversible, and the limb would remain frozen in the resulting position.
• C)the contraction of the biceps would cause tearing of fibers in the triceps and severe muscle damage.
• D)the fibers that make up the triceps muscle would shorten and thicken during the resulting passive stretch.

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