Question

'Ascidian' heart is unique amongst chordates, in sense that

• A. It has completely divided four chambers
• B. Heart is without any chamber
• C. It can change the direction of blood flow by reverse peristalsis at regular intervals
• D. It has no valves

Answer 1

The correct option is C It can change the direction of blood flow by reverse peristalsis at regular intervals

The heart is a complex organ developed as a part of the circulatory system in the higher organism. The 'ascidian heart' does not function before metamorphosis and in adults, it consists of a simple U-shaped tube, that beats peristaltically in a reversible orientation to pump blood through an open circulatory system. The two excitatory areas are present at the end of each heart with the first one being dominant, to push the blood through the ventral vessel, and then the other, pushing it dorsally.

So, the correct answer is option C.