A) Sympathetic nervous system, voluntary
B) Sympathetic nervous system, involuntary
C) Parasympathetic nervous system, involuntary
D) Both SNS and PNS involuntary
Correct Answer: D
Solution :
Blood pressure and blood flow, through blood vessels are maintained under control of autonomic nervous system which is involuntary. It consist of SNS (Sympathetic Nervous System) and PNS (Parasympathetic Nervous System).
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