The composition of the white matter of spinal cord is _.
Correct answer: D. Myelinated axon
- A. Myelinated dendrite
- B. Non-myelinated dendrite
- C. Non-myelinated axon
- D. Myelinated axon
Explanation
The correct option is D. The composition of the white matter of the spinal cord is myelinated axons. Myelin is a fatty sheath that surrounds axons, which are the long fibers that transmit nerve signals. Myelin helps to insulate axons and speed up the conduction of nerve signals. The white matter of the spinal cord is made up of bundles of myelinated axons. These bundles are called tracts. Tracts are responsible for carrying different types of sensory and motor information up and down the spinal cord.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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