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Which is not true about an amphibian hea...

Which is not true about an amphibian heart ?

A

It is a myogenic heart

B

Two atria open in single ventricle

C

It is an arterovenous heart

D

Sinus venosus is replaced by SA node

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statement is not true about an amphibian heart, let's analyze each option step by step. ### Step-by-Step Solution: 1. **Understanding the Structure of the Amphibian Heart:** - Amphibians, such as frogs, have a three-chambered heart consisting of two atria and one ventricle. This structure allows for some mixing of oxygenated and deoxygenated blood. 2. **Evaluating the Options:** - **Option 1: "It is a myogenic heart."** - This statement is true. The contraction of the heart in amphibians originates from the heart muscle itself, which is characteristic of a myogenic heart. - **Option 2: "Two arteries are open in the single ventricle."** - This statement is also true. In amphibians, both the pulmonary artery and the systemic artery open into the single ventricle. - **Option 3: "It is an Arteriovenous heart."** - This statement is true as well. An arteriovenous heart indicates a connection between the arteries and veins, which is consistent with the amphibian heart structure. - **Option 4: "Sinus venosus is replaced by SA node."** - This statement is not true. In amphibians, the sinus venosus is present and is not replaced by the SA node, which is a feature of the mammalian heart. The SA node serves as the pacemaker in mammals, but amphibians do not have an SA node in the same way. 3. **Conclusion:** - The statement that is not true about the amphibian heart is **Option 4: "Sinus venosus is replaced by SA node."** ### Final Answer: - The incorrect statement about the amphibian heart is **Option 4**.
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