............ heart of cockroach chamber is without ostia

1st prothoracic

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Last thoracic

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First abdominal

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Last abdominal

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Solution

The correct option is B 1st prothoracic
Heart of cockroach is long and is 13 chambered. Each chamber of the heart receives oxygenated blood from the dorsal sinus through ostia. Ostia are guarded by auricular valves which prevents the back flow of blood. First prothoracic chamber of cockroaches do not posses ostia.

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