Question
Describe the heart in cockroach.
✓
Answer
Heart: It is about $2.5 \ cm$ long, narrow, muscular tube that is open anteriorly and closed posteriorly. It starts from $9^{th}$ abdominal segment and extends anteriorly upto $1^{st}$ thoracic segment. Heart of cockroach is $13$ chambered, out of which $10$ chambers are in abdominal region and $3$ chambers are in thoracic region. Each chamber has a pair of vertical slit$-$like incurrent aperture or opening called ostium $($plural: ostia$).$ Ostia are present along lateral side in the posterior region of first $12$ chambers. Each ostium has lip$-$like valves that allow the flow of blood from sinus to heart only.
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