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Tracheal System
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A network of tubes in insects that enables gas exchange.
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Spiracles
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Narrow openings that lead to the trachea in insects for gas exchange.
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12 Terms
1
Tracheal System
A network of tubes in insects that enables gas exchange.
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2
Spiracles
Narrow openings that lead to the trachea in insects for gas exchange.
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3
Trachea
Large tubes that carry air into the insect's body.
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4
Tracheoles
Smaller tubes branching from the tracheae that reach individual cells for direct gas exchange.
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5
Pathway of Gas Exchange
The sequence: Spiracles → Tracheae → Tracheoles → Cells.
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6
Diffusion
The process by which gases (O₂ and CO₂) move directly between the tracheoles and body cells.
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7
Diffusion Gradient
O₂ moves from high concentration in the air to low concentration in the cells; CO₂ moves from high concentration in cells to low concentration outside.
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8
Closed Spiracles
Spiracles that prevent water loss in dry conditions.
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9
Open Spiracles
Spiracles that allow gas exchange when needed.
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10
Active Transport Mechanism
Ventilation used by some larger insects to actively move air through the tracheal system.
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11
Adaptations for Gas Exchange in Insects
Includes the tracheal system for direct delivery of oxygen and small size that allows diffusion.
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12
Gas Exchange Control
Spiracles regulate gas exchange and water loss by opening and closing.
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