amphibians kingdom: animalia phylum: chordata animals with a backbone
TRANSCRIPT
AMPHIBIANSKingdom: AnimaliaPhylum: Chordata
Animals with a backbone
Phylum Chordata
• Classes:– Amphibia– Reptilia– Aves– Chondrichthyes– Osteichthyes– Mammalia
General Characteristics• It is an animal in
Kingdom Animalia, Phylum Chordata, Class Amphibia
• Most lay eggs in WATER.
• It is an ECTOTHERMECTOTHERM – body temperature is determined by environment (opposite = Endotherm)
Salamander vs. Newt
Which one is an amphibian?
Life Cycle
• Begin life as an Egg mass (Eggs are Moist, not Hard)
• Go through Metamorphosis
• Egg to Tadpole to Tadpole frog to Young frog to Adult frog
• External Fertilization
Respiratory System• Begin their lives with
gills and most end their lives with lungs.
• Some can breathe through their skin – their skin is permeable (allowing materials to flow in the frog to out of frog)
• So…how does the oxygen get in our blood?
Let’s take a look at Humans…
• 4 chambered heart• Very efficient• Let’s label…
– Right ventricle– Left ventricle– Right Atria– Left Atria– Aorta– To lungs (not oxygenated)– From lungs (oxygenated)– To body (oxygenated)– From body (not oxygenated)
Cardiovascular System
• Frogs have a 3 chambered heart
• Consisting of 2 atria and 1 ventricle.
• Lungs help to oxygenate the blood and also take out carbon dioxide
Digestive System• Mouth – break down of food• Gullet• Esophagus• Stomach – break down of food• Small intestine – food is
digested and absorbed• Liver makes bile; gall bladder
stores bile• Pancreas secretes enzymes to
break down food• Large intestine – water is
absorbed• Cloaca – excretes exit
Digestive System
• Accessory organs help to digest food
• Liver – makes bile• Gall bladder – stores
bile• Pancreas – secretes
enzymes to help with digestion
Excretory System
• Kidneys – remove toxins from blood
• Toxins travel through the ureter (tube) until it reaches the bladder.
• Bladder holds the urine until it is excreted through the cloaca.
Importance
• Amphibians help us to monitor the environment
• Check the handout for more information
Frog Malformations