Question

Describe the structure of trachea of cockroach

Answer 1

Cockroaches breathe through a system of tubes attached to their spiracles. Spiracles are small valves along a cockroach's body that allows air into the trachea, much like gills do for a fish. This system of tubes is called the tracheae; thus cockroaches are not dependent upon a windpipe and mouth to breathe.

Answer 2

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The haemocoel of terrestrial insects including cockroach contains a system of network of elastic, closed, branching and silvery white tubes called tracheae. The tracheae are formed by the in pushing of the ectoderm, hence, its wall consists of three layers taenidia or intima, basement membrane and epithelium.

The intima is the cuticular lining in the form of spiral or ring-like thickenings which prevents the tracheae from collapsing. There are three pairs of large longitudinal tracheal trunks—one dorsal, one ventral and one lateral in position. All these trunks are connected by transverse commissures, thus, they anastomose to form a network which reaches to every part of the body.

The ultimate branches of tracheae end in tracheole cells from which arise very fine tubes called tracheoles.

The tracheoles have thinned cuticle lining and they end blindly in the tissue cells. In a resting insect when respiratory activity is not high, the tracheoles are filled, not with air but with a tissue fluid of cells in which oxygen dissolves. By means of this system of tracheae the cells of the body or their fluids are in direct communication with the environmental air.

However, the thoracic spiracles lead into several tracheal trunks directly, while each abdominal spiracle leads into the lateral longitudinal trunks of their sides.

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