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Frog’s heart when taken out of the body continues to beat for sometime. Select the best option from the following statements.

1. Frog is a poikilotherm.
2. Frog does not have any coronary circulation.
3. Heart is “myogenic” in nature.
4. Heart is autoexcitable

Correct answer: Heart is “myogenic” in nature.

Solution

A frog’s heart can continue beating outside the body because the cardiac muscle itself initiates rhythmic contractions. This is the definition of a myogenic heart, where the impulse originates in the heart muscle rather than requiring external nerve stimulation.

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