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NEETZoologyStructural Organisation in Animals

Which of the following statements regarding the circulatory system of a frog is incorrect?

Options

  1. AA special venous connection between the liver and intestine in frogs is called the renal portal system.
  2. BThe heart of a frog is a muscular structure consisting of two atria and one single ventricle.
  3. CThe sinus venosus is a triangular structure attached dorsally to the heart.
  4. DThe left atrium of the frog heart receives oxygenated blood from the lungs and skin.

Correct answer

A. A special venous connection between the liver and intestine in frogs is called the renal portal system.

Step-by-step solution

Frogs possess special venous connections between certain organs. The venous connection between the liver and intestine is called the hepatic portal system, not the renal portal system. The renal portal system connects the kidneys and the lower parts of the body. Therefore, the statement regarding the renal portal system connecting the liver and intestine is incorrect. The other statements are correct: the frog heart has three chambers (two atria and one ventricle), the sinus venosus is attached dorsally, and the le

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