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Amphibians

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Amphibians 'having two lives' land and water. General characteristics. smooth, moist skin ... are 3 orders of amphibians. Anura - frogs and toads. Caudata ... – PowerPoint PPT presentation

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Title: Amphibians


1
Amphibians
having two lives land and water
2
(No Transcript)
3
General characteristics
  • smooth, moist skin
  • 3 chambered heart
  • external fertilization
  • cold blooded - ectothermic
  • respire with gills ( young ),
  • lung and/or skin in adults

4
  • eggs must be laid in moist
  • environment
  • eggs are jelly-like.

5
amplexus - male clasps female and sheds sperm
onto her eggs
6
  • Fish 2 chambered heart
  • 1 atrium and 1 ventricle
  • a low pressure system
  • one continuous loop

7
From body
atrium
ventricle
To lung
FISH HEART
8
  • Amphibians -
  • 3 chambered heart
  • with 2 circulatory loops
  • pulmonary loop
  • ( heart lung heart )
  • systemic loop- delivers O2
  • ( heart body heart )

9
From lung
AMPHIBIAN HEART
atrium
From body
ventricle
To lung
atrium
To body
10
from lung
to lung
from body
Blood to body is pressurized
organs, muscles
11
Amphibians evolved 350 mya in The Devonian
period from lobe finned fish like the
Coelocanth
12
Lobe finned Coelocanth
13
(No Transcript)
14
Icthyostega ancient amphibian
15
  • There are 3 orders of amphibians
  • Anura - frogs and toads
  • Caudata salamanders
  • Caecilians - legless

16
caecilians
17
Cooked frog legs
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