Concept:The autonomic nervous system controls involuntary body activities.
Explanation:The autonomic nervous system works automatically, without conscious effort.
It regulates internal organs such as the heart, stomach, and glands.
It influences glands, cardiac muscle, and smooth muscle.
It does not always stimulate effectors; it can also inhibit them.
Voluntary actions and responses to external stimuli are handled by the somatic nervous system.
Therefore, the correct statement is the one that describes its action on glands, cardiac muscle, and smooth muscle.
Answer:D. It affects glands, cardiac muscles and smooth muscles.