Questions and Answers
What is the main difference between the aspiration pump and the dual and buccal pumps?
The aspiration pump does not push air into the lung against a resisting force, instead, air is sucked in, or aspirated, by the low pressure created around the lungs.
How does the diaphragm contribute to the functioning of the aspiration pump?
The diaphragm, like a plunger, alters the pressure on the lungs to favor entry or exit of air.
What is the direction of air movement in the aspiration pump?
The aspiration pump is bidirectional, moving air tidally.
In which group of animals is the aspiration pump highly modified?
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What is the advantage of the decoupling of feeding and ventilation mechanisms in animals that use the aspiration pump?
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What is the characteristic of the aspiration pump that allows for efficient ventilation in amniotes?
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Study Notes
Aspiration Pump
- The aspiration pump is a type of ventilation mechanism that doesn't push air into the lungs against a resisting force, instead, it sucks air in through low pressure created around the lungs.
- The lungs are located within the pump, allowing the force required for ventilation to be applied directly.
- The "pump" includes the rib cage and often a muscular diaphragm.
Mechanism of Aspiration Pump
- The diaphragm, like a plunger, alters the pressure on the lungs to favor entry or exit of air.
- The diaphragm's movement causes pressure changes, leading to ventilation.
Characteristics of Aspiration Pump
- The aspiration pump is bidirectional and moves air tidally.
- It is found in amniotes, including reptiles, mammals, and birds.
Modifications in Birds
- In birds, the aspiration pump is highly modified.
- The buccal cavity is no longer part of the pumping mechanism.
Advantage of Aspiration Pump
- Decoupling of feeding and ventilation mechanisms allows for independent diversification of the feeding and ventilation mechanisms in vertebrates.
- This functional decoupling increases the opportunities for diversification of the feeding and ventilation mechanisms.
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