Since it is the sinu-auricular node which initiates the impulses in the heart of mammal is called
ANSWERS:(a) Cholinergic (b) Adrenergic
( C) Neurogenic (d) Myogenic
EXPLANATION:(d) Myogenic heart has contraction initiated by a special node of modified heart muscles called sinu-artial node (S.A node) e.g., the heart of vertebrates, tunicates and mollusca.
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