amphibian gas exchange notes

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Amphibian Gas Exchange Amphibian Gas Exchange By Mr. “Short day” Chapman By Mr. “Short day” Chapman

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Page 1: Amphibian Gas Exchange Notes

Amphibian Gas ExchangeAmphibian Gas ExchangeBy Mr. “Short day” ChapmanBy Mr. “Short day” Chapman

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Before we get started:Before we get started:Habitat Types: (Fossorial, arboreal, Habitat Types: (Fossorial, arboreal, terrestrial, aquatic)terrestrial, aquatic)1. Fossorial – lives underground1. Fossorial – lives underground2. Arboreal – lives in trees2. Arboreal – lives in trees3. Terrestrial – lives on land3. Terrestrial – lives on land4. Aquatic – lives in water4. Aquatic – lives in water

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Think about this?Think about this?One of the ways One of the ways that amphibians that amphibians have adapted to have adapted to their “less than their “less than perfect” circulatory perfect” circulatory system is…..system is…..They have more They have more than one surface than one surface for gas exchange.for gas exchange.

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RespirationRespirationAmphibians exchange gases across Amphibians exchange gases across four surfaces.four surfaces.

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RespirationRespiration1.1. GillsGills – the gill arches may be – the gill arches may be inside or outside the animal’s inside or outside the animal’s head.head.

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RespirationRespiration2.2. LungsLungs – not all amphibians – not all amphibians have them. have them.

Those of frogs are complex.Those of frogs are complex.

Salamanders and Caecilians have Salamanders and Caecilians have simple lungs.simple lungs.

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RespirationRespiration3. 3. Buccopharyngeal RespirationBuccopharyngeal Respiration – through the lining of the mouth – through the lining of the mouth & throat. The throat of all & throat. The throat of all amphibians has many amphibians has many blood blood vessels. vessels. Gases can diffuse into or out of Gases can diffuse into or out of those blood vessels with relative those blood vessels with relative efficiency.efficiency.

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RespirationRespiration4. Cutaneous (Dermal) Respiration – 4. Cutaneous (Dermal) Respiration – the exchange of gases across the the exchange of gases across the surface of the skin. surface of the skin.

In order for this to take place, the In order for this to take place, the skin must remain moist.skin must remain moist.

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Convergent Convergent EvolutionEvolution - is the - is the process whereby process whereby organisms not closely organisms not closely related evolve similar related evolve similar traits as a result of traits as a result of having to adapt to having to adapt to similar environments similar environments or ecological niches. or ecological niches.

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ORDER LUNGS BUCCOPHARYNGEAL CUTANEOUS GILLS

SALAMANDERS

FROGS & TOADS

CAECILIANS

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ORDER LUNGS BUCCOPHARYNGEAL CUTANEOUS GILLS

SALAMANDERS Some 100% 100% Some

FROGS & TOADS

CAECILIANS

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ORDER LUNGS BUCCOPHARYNGEAL CUTANEOUS GILLS

SALAMANDERS Some 100% 100% Some

FROGS & TOADS 100% 100% 100% None

CAECILIANS

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ORDER LUNGS BUCCOPHARYNGEAL CUTANEOUS GILLS

SALAMANDERS Some 100% 100% Some

FROGS & TOADS 100% 100% 100% None

CAECILIANS Some 100% 100% None

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ActivityActivityAn organism is considered to be An organism is considered to be _______ when active at night._______ when active at night.NocturnalNocturnalAn organism is considered to be An organism is considered to be _______ when active during the day._______ when active during the day.DiurnalDiurnal