There are three sinuses in the cockroach that contain haemolymph. The haemocoel i.e. the body cavity is divided into three sinuses (Dorsal-Pericardial haemocoel, middle- Perivisceral haemocoel and ventral- Perineural haemocoel) by two muscular horizontal membranes; dorsal diaphragm and ventral diaphragm. Dorsal sinus contains heart and ventral sinus contains nerve cord are smaller as compare to the middle larger sinus containing most of the viscera.
(b.) discard the faulty results that do not support the original hypothesis, and repeat the experiment using the same methods.
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