A) heartbeat
B) secretion of digestive juice
C) Secretion of saliva
D) All of the above
Correct Answer: A
Solution :
Medulla of brain has two regions affecting heart rate-(i) cardiac inhibitory centre, (ii) 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 the part of sympathetic nervous system cause an increase in heartbeat.
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