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Avian respiratory system

avian-respiratory-system

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Where is the glottis in most birds?

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Are the bird's tracheal rings complete or partial?

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Is the trachea of birds longer or shorter than mammals?

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How do birds compensate for a large dead space caused by a longer trachea?

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What is the syrinx used for?

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Where is the syrinx located?

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Sound is produced by the tympaniform membranes in the syrinx when air flows past causing them to vibrate.

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What is the direction of airflow in avian lungs?

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When does air pass over the lungs in birds?

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How may cell layers thick are air sacs?

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How many air sacs do birds have?

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What are the cranial air sacs?

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Compare the lungs

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Mammals
Birds

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Bidirectional, alveolus, branching, elastic and compliant lungs.
Unidirectional, parabronchi, non compliant.

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Order the branching of the avian bronchi.

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4 sets of secondary bronchi (ventral and dorsal)
Mesobronchus
Parabronchi: paleopulmonic and neopulmonic
Primary bronchi at syrinx
Trachea

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Where does gas exchange occur?

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