A) heart-beat
B) secretion of digestive juices
C) secretion of saliva
D) all of die 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 part of sympathetic nervous system cause an increase in heart beat.
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