Which structure is a major component of the nervous system?

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Multiple Choice

Which structure is a major component of the nervous system?

Explanation:
The nervous system comprises the brain and spinal cord as its central components, with nerves extending to the rest of the body. The spinal cord is a major component because it serves as the main conduit for transmitting nerve signals between the brain and the body, and it also contains circuits that control many reflexes. The heart belongs to the circulatory system, the lymph node to the immune system, and the pancreas to the digestive/endocrine systems; none of these are primary structures of the nervous system, though they can be innervated by nerves. Therefore, the spinal cord best fits as a major nervous system structure.

The nervous system comprises the brain and spinal cord as its central components, with nerves extending to the rest of the body. The spinal cord is a major component because it serves as the main conduit for transmitting nerve signals between the brain and the body, and it also contains circuits that control many reflexes. The heart belongs to the circulatory system, the lymph node to the immune system, and the pancreas to the digestive/endocrine systems; none of these are primary structures of the nervous system, though they can be innervated by nerves. Therefore, the spinal cord best fits as a major nervous system structure.

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