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  4. Tubular heart of cockroach has how many chambers?

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Q. Tubular heart of cockroach has how many chambers?

AFMCAFMC 2005Structural Organisation in Animals

Solution:

Circulatory system of cockroach is open or lacunar type. Tubular heart of cockroach is situated in pericardial sinus over the dorsal diaphragm. It is longitudinally beaded with $13$ chambers perforated by ostia having valves.