General Autonomic Effects: Which statement is accurate?

General Autonomic Effects: Which statement is accurate?

• A. All Regions Mediate Only Sympathetic Activity
• B. No Autonomic Control
• C. Parasympathetic And Sympathetic Activated By The Same Region
• D. Different Regions Mediate Sympathetic Or Parasympathetic Activity

Answer: (D)

The main idea is that autonomic control is organized so that different parts of the CNS predominantly drive one division over the other. The sympathetic system comes from thoracic–lumbar regions of the spinal cord and uses chain and prevertebral ganglia to reach effectors, while the parasympathetic system arises from brainstem nuclei (cranial nerves) and sacral spinal segments, with postganglionic neurons near or in the target organs. Because of this separation, distinct CNS regions govern sympathetic versus parasympathetic activity. That’s why the statement that different regions mediate sympathetic or parasympathetic activity is accurate. The other options conflict with this anatomical and functional organization: there is autonomic control; there isn’t a single region that only mediates sympathetic activity; and a single region does not typically activate both divisions.

The main idea is that autonomic control is organized so that different parts of the CNS predominantly drive one division over the other. The sympathetic system comes from thoracic–lumbar regions of the spinal cord and uses chain and prevertebral ganglia to reach effectors, while the parasympathetic system arises from brainstem nuclei (cranial nerves) and sacral spinal segments, with postganglionic neurons near or in the target organs. Because of this separation, distinct CNS regions govern sympathetic versus parasympathetic activity. That’s why the statement that different regions mediate sympathetic or parasympathetic activity is accurate. The other options conflict with this anatomical and functional organization: there is autonomic control; there isn’t a single region that only mediates sympathetic activity; and a single region does not typically activate both divisions.