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Q.

Lateral oesophageal hearts are present in which segments of Pheretima?

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a

10th and 11th

b

13th and 14th

c

7th and 9th

d

12th and 13th   

answer is A.

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Detailed Solution

The dorsal and ventral vessels are connected to each other in segments 7, 9, 12 and 13 by means of paired pulsatile hearts. The hearts in 12th and 13th segments are called lateral oesophageal hearts while the anterior pairs in the 7th and 9th segments are called lateral hearts.

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Lateral oesophageal hearts are present in which segments of Pheretima?