A:
Central Nervous System
B:
Sympathetic Nervous System
C:
Parasympathetic Nervous System
D:
Autonomic Nervous System
Explanation
The respiratory mechanism is primarily controlled by the central nervous system (CNS).
The CNS includes the brain and spinal cord, and it is responsible for coordinating and regulating many of the body's functions, including respiration. The respiratory center, located in the brainstem, controls the rate and depth of breathing by sending nerve impulses to the diaphragm and other respiratory muscles.
While the sympathetic and parasympathetic nervous systems can influence respiration, their primary functions are to regulate other bodily functions, such as heart rate and digestion. The autonomic nervous system, which includes both the sympathetic and parasympathetic divisions, also plays a role in regulating respiration, but the primary control comes from the respiratory center in the CNS.
Therefore, option A (Central Nervous System) is the correct answer.
