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Frog's heart when taken out of the body ...

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

A

Only IV

B

I and II

C

III and IV

D

Only III

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding why a frog's heart continues to beat after being taken out of the body, we can analyze the provided statements one by one: ### Step 1: Understand the nature of the frog's heart The frog's heart is classified as "myogenic," meaning that it is capable of generating its own impulses to contract without needing external nervous stimulation. This is similar to the human heart. **Hint:** Myogenic hearts can beat independently due to their intrinsic properties. ### Step 2: Evaluate the statements - **Statement I: Frog is a poikilotherm.** - This statement is true, as frogs are indeed poikilothermic (cold-blooded) animals. However, it does not directly explain why the heart continues to beat outside the body. - **Statement II: Frog does not have any coronary circulation.** - This statement is misleading. While frogs have a different circulatory system compared to mammals, they do have a form of coronary circulation, albeit less developed. This statement does not support the heart's ability to beat outside the body. - **Statement III: Heart is "myogenic" in nature.** - This statement is correct. The myogenic nature of the frog's heart means it can generate its own electrical impulses, allowing it to continue beating even when removed from the body. - **Statement IV: Heart is autoexcitable.** - This statement is also correct. The heart's autoexcitability refers to its ability to initiate its own contractions without external stimuli, which is a characteristic of myogenic hearts. ### Step 3: Identify the best options From the analysis, Statements III and IV are the most relevant to the question. They both explain why the frog's heart can continue to beat outside the body. ### Conclusion The best options that explain why a frog's heart continues to beat when taken out of the body are: - **Statement III: Heart is "myogenic" in nature.** - **Statement IV: Heart is autoexcitable.** **Final Answer:** The frog's heart continues to beat outside the body primarily due to its myogenic nature and autoexcitability. ---
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