How is blood supplied to the visceral organs?
Correct answer: A. By both the SNS and the PNS involuntarily
- A. By both the SNS and the PNS involuntarily
- B. By the parasympathetic nervous system involuntarily
- C. By the sympathetic nervous system involuntarily
- D. By the sympathetic nervous system voluntarily
Explanation
The blood is supplied into visceral organs by both SNS (sympathetic nervous system) and PNS (parasympathetic nervous system) involuntarily. The sympathetic fibres increase the rate and force of the heartbeat, constrict most blood vessels and raise the arterial blood pressure. The parasympathetic fibres decrease the rate and force of the heartbeat, dilate many blood vessels and lower the arterial blood pressure.
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Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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