A) Purkinje fibres
B) myonemes
C) telodendria
D) columnae carnae
Correct Answer: A
Solution :
The heart wall of frog composed of epicardium, myocardium and endocardium. The myocardium is composed of branched and striated yet involuntary cardiac muscles which contracts and relax rhythmically at a fixed rate. The fibres of the self-excitatory and conducting muscle of the heart are of three types nodal fibres, transitional fibres and Purkinje fibres. In frog heart, a number of muscular ridges called columnae carnae projected from the wall of ventricle into its cavity, dividing the peripheral part of the cavity into a number of pockets.
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