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Topic: Frog: digestive, circulatory, respiratory, nervous and reproductive systems· Structural Organisation in Animals and Plants

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 auto…

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.

Options :

1. Only (d)

2. (a) and (b)

3. (c) and (d)

4. Only (c)

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Best answer

Answer: 3. (c) and (d)

An isolated frog heart keeps beating because it is myogenic (the beat starts in the heart muscle itself) and autoexcitable (the sinus venosus generates impulses by itself).

Being a poikilotherm or lacking coronary circulation does not explain the beating. So (c) and (d) are correct.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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