Question

The heart of a Cockroach is
a. Myogenic
b. Neuro Myogenic
c. Neurogenic
d. None of the above

Answer 1

Hint: A cockroach is an insect that belongs to the phylum Arthropoda and class Blattodea. Nearly 30 species of cockroaches live in human habitats. Five cockroaches are pests. It has a dorsal, thirteen chambered tubular heart. Cockroach heart is much more resistant to failure than human hearts. Cockroaches are hardy insects that can tolerate a wide range of environments from Arctic cold to tropical heat.

Complete answer:
Cockroach belongs to the phylum Arthropoda. The heart of a cockroach is neurogenic because it requires a nervous impulse to contract. On the wall of the heart cluster of neurons is present that produces the rhythmic motor output for the heartbeat. The neurogenic heart is present in lower invertebrates. In a neurogenic heart, the heartbeat is initiated by a ganglion present on the heart.
The myogenic heart is present in mollusks and vertebrates. In a myogenic heart, the heartbeat is under the control of muscles.

Hence, the correct answer is option (C).

Additional information:
- In cockroaches, a pair of slit-like openings called Ostia is present by which oxygenated blood enters each chamber of the heart.
- The first chamber of the heart enters into the aorta which then opens into head sinuses.
- Cockroaches include termites also.
- Cockroaches make use of pheromones to attract mates.
- Cockroaches are omnivorous.

Note: The heart of the cockroach is neurogenic. The neurogenic heart is a type of heart that requires nervous input to contract. Cardiac ganglion which is a cluster of neurons is present on the heart wall of cockroach and it produces rhythmic motor output for the heartbeat. Cockroach heart is present on the dorsal side and it consists of ten abdominal and three thoracic chambers of the heart.