1.

Sympathetic neural system inducesA. heartbeatB. secretion of digestive juicesC. secretion of salivaD. All of the above

Answer» Correct Answer - A
Medulla of brain has two regions affecting heart rate (a) cardiac inhibitory centre, (b) cardiac accelerator centre. Sensory nerves originating from the accelerator centre run parallel to the spinal cord and enter the sino-atrial node. Stimulation by these nerves, which are part of sympathetic nervous system cause an increase in heartbeat.


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