Frog's heart when taken out of the body continues to beat for sometime. Select the best option from the following statements. A. Frog is a poikilotherm. B. Frog does not have any coronary circulation. C. Heart is "myogenic" in nature. D. Heart is autoexcitable.

Frogs heart is myogenic in nature which means it originates in muscle tissue and not from nerve impulse and it is auto excitable( does not need external stimuli). When frogs heart taken out of the body continues to beat for some time that is till the time ATP is available, because it is not dependent on nervous system and does not require external stimuli as SA node can generate action potential on its own. Thus, option C and D is the correct answer.