Statement 1: Small amount of urea enters the thick segment of Henle's loop which is transported back to interstitium by collecting tubules.
Statement 2: Collecting tubules and the thick segment of Henle's loop are permeable to urea.

Both statements 1 and 2 are correct.

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Statement 1 is correct but statement 2 is incorrect.

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Statement 1 is incorrect but statement 2 is correct.

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Both statements 1 and 2 are incorrect.

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Solution

The correct option is D Both statements 1 and 2 are incorrect.
Chordae tendineae are cords that prevent the valve from collapsing back into the right atrium during powerful right ventricular contraction. When the right ventricle contracts forcing blood into the pulmonary artery, the tricuspid valve closes the aperture to the right atrium thereby preventing any backflow of blood. Thus, if chordae tendineae of the tricuspid valve becomes partially non-functional, then the flow of blood into the pulmonary artery will be reduced.
So the correct answer is 'Both statements 1 and 2 are incorrect.'.

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Statement 1: Small amount of urea enters the thick segment of Henle's loop which is transported back to interstitium by collecting tubules.Statement 2: Collecting tubules and the thick segment of Henle's loop are permeable to urea.

Statement 1: Small amount of urea enters the thick segment of Henle's loop which is transported back to interstitium by collecting tubules.
Statement 2: Collecting tubules and the thick segment of Henle's loop are permeable to urea.