Frog's heart when taken out of the body continues to beat for some time. 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

The heart of a frog (and other vertebrates) is myogenic, meaning the impulse for contraction originates within the muscle itself, not from the brain. It is also autoexcitable, as the specialized nodal tissue can generate action potentials without external stimuli. These two properties allow it to beat outside the body as long as it has oxygen and nutrients.