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TRANSPORT IN PLANTS AND ANIMALS
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EXCRETION AND HOMEOSTASIS
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Biology Form 2
About Lesson

Gaseous Exchange in Insects

In insects, air enters the body through small openings on the thorax and abdomen called spiracles. The spiracles have hair around the opening and valves.

The hairs prevent loss of moisture from the tracheal system.

The hairs prevent the entry of dust particles into the tracheal system.

The valves control the entry and exit of the respiratory gases.

The spiracles open up to a system of branching tubes called the tracheal system.

Trachea:

The trachea is tubular to allow passage of air during ventilation.

 The trachea has rings of chitin to keep the trachea open and therefore prevent it from collapsing during gaseous exchange.

Tracheole

Tracheoles lack rings of chitin, and therefore thin-walled to shorten diffusion distance for respiratory gases

Tracheoles are fluid filled/have moist surface to dissolve diffusing gases.

Tracheoles have thin epithelium to shorten diffusion distance for respiratory gases.

They are highly ramified to increase the surface area for gaseous exchange.

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