AP EAMCET Medical 2015 Paper

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Question : 69 of 160

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Which of the following statements is incorrect pertaining to cockroach?

Ostia have valves which allow the blood to pass only in to the heart.
Thorasic and abdominal spiracles are valvular.
The wall of the trachea is made with lamina propria, endothelium and taenidia.
The taenidia keeps the trachea always open and prevent it from collapsing

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