Frog's heart when taken out of the body continues to beat for sometime.
Select the best option from the following statements.
I. Frog is a poikilotherm.
II. Frog does not have any coronary circulation.
III. Heart is "myogenic" in nature.
IV. Heart is autoexcitable.
(1) Only III
(2) Only IV
(3) I and II
(4) III and IV