The corticospinal tract carries motor signals from the primary motor cortex in the brain, down the spinal cord, to the muscles of the trunk and limbs. And The corticobulbar tract carries efferent, motor, information from the primary motor cortex to the muscles of the face, head and neck.
Answer:
A concentric contraction because muscles cause the elbow joint and arm to move is the correct answer.
Explanation:
5. meth, heroin, and cocaine
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