Which of the following structures and functions describes the ascending tracts of the spinal cord?
a. They are made of white matter and carry motor impulses.
b. They are made of gray matter and carry motor impulses.
c. They are made of white matter and carry sensory impulses.
d. They are made of gray matter and carry sensory impulses.
ANS: C
The gray matter is where the cell bodies of motor neurons and interneurons are located. The white matter is the myelinated axons. These nerve fibers are arranged in tracts based on their functions; ascending tracts transmit sensory impulses to the brain, and descending tracts transmit motor impulses from the brain to motor neurons.
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