Question

Ampullary accessory hearts are present in

• A. Cockroach.
• B. Frog.
• C. Rabbit.
• D. Earthworm.

Answer 1

Answer: (A)

Cockroach.

In addition to the main systemic heart, many species have accessory booster hearts at critical points in the circulatory system. The dorsal vessel and the two large diaphragms are responsible for pumping hemolymph through the main body cavity of insects. However, these organs are incapable of achieving circulation in body appendages such as the antennae, legs, wings and various long abdominal processes (e.g., cerci and ovipositors). To supply these appendages insects rely on special, small circulatory pumps, known as 'accessory pulsatile organs' or accessory hearts.

Accessory hearts are separate from the dorsal vessel and function autonomously. The pumping organ is generally located at the base of the appendage and is connected to vessels or special diaphragms, which guide the flow of haemolymph through the appendage. The antennal heart of the cockroach functions not only as a circulatory pump but also as a neurohaemal organ.