A and chemical X on the functioning of the heart (2 marks)(b)In another experiment, the heart rate of the dog under each of the following conditions was monitored :(1)in the resting state (as the control),(2)electrical stimulation of nerve A which innervates the heart, and(3)electrical stimulation of nerve B which also innervates the heart.The results are as follows :Resting stateNerve A stimulationNerve B stimulationHeart rate (beats/min)130180100(i)State the effects of the above nerve stimulations on heart rate. What can you deduce about the nature of innervations to the heart ?(2 marks)(ii)Outline the mechanism which affects the heart rate under each of the following conditions:(1)in the resting state(2)when nerve A is stimulated(3)when nerve B is stimulated(4 marks)(iii)Which part of the nervous system is responsible for regulating the activities of nerves A and B ?(1 mark)(c)Based on the results of all the above experiments, summarise your understanding on the mechanism controlling cardiac function.(3 marks)(d)How would the heart rate of the dog at the resting state compare with that of man ? Account for such a difference.