Question

Number of pairs of valves found in lateral oesophageal heart of Pheretima is

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

Answer: (C)

3

The posterior two pairs connect both the dorsal blood vessel and the supra-oesophageal blood vessel with the ventral blood vessel. Hence they are called lateral-oesophageal hearts.

These two types of hearts also differ in number and arrangement of their valves. Four pairs of valves are present in each lateral heart, while three pairs of valves are present in each lateral oesophageal heart.

So the correct answer is '3'.