Vertebrates 3 Flashcards
Reptiles vs Amphibians
Reptiles:
- More effiecient heart
-Breathe via lungs only
-Must conserve water
Reproduce & develop on land
Amphibians:
-Must reproduce in water
-Must remain close to water
-Less efficient heart
-Can breathe through gills
Reptiles Reproduction Types
- Amniotic Egg
- Internal fertilization
Amniotic Egg
-All reptiles must lay there eggs on land
-Has an external shell
-Shell is permeable to gasses(allowing diffusion)
-Impermeable to water
Albumen: provides water and mechanical support
Chrion: gas exchange
Yolk sac: Nutrients
Amnion: embryo
Allantois: waste
Consequences of a terrestrial egg?
-must fertilize the egg before they are born(due to the shell)
-Internal fertilization (shell and albumen are added to the fertilized egg)
How does the reptiles release excretory products?
-Salts and ions are released by skin, gills, kidneys or special glands
-Fecal matter is released by the digestive tract
What causes nitrogenous wastes?
- Protein and DNA metabolism(common in carnivorous animals)
-Metabolism of fats, carbs, proteins and nucleic acids causes nitrogenous waste biproducts such as ammonia, urea and uric acid
Ammonia
-Very Soluble
-Very Toxic
-Needs to be diluted and disposed of quickly or converted to a less toxic form(uric acid)
Who produces ammonia?
Ray-finned fish
Aquatic invertebrates
Larval amphibians
Urea
-Soluble in water
-Medium level of toxicity
-Less water needed for disposal compared to ammonia
Who produces urea?
-Adult amphibians
-Cartilaginous fish
-Mammals
Uric Acid
-Insoluble in water
-Non toxic
-Little water needed for disposal(great for things that fly)
Who produces Uric Acid?
-Insects
-Reptiles(perfect for the amniotic egg)
-Birds(perfect for the amniotic egg)
What is the excretory organ in vertebrates and what does it do?
Kidney. Regulates levels of water and dissolves solutes in the blood to create urine
How does the kidney work?
Blood goes into globarius and then anything large(glucose, water) is forced out of the globarius into the bowman’s capsule. Glucose and large items then go down the bloodstream and peritubular capillaries suck the nutrients such as glucose back and the urea back. The urea is then excreted back out again.
Name the four reptile groups?
-Crocodilia
-Lepidosauria(lizards)
-Testudinia
-Squamates(snakes)