Reptiles Flashcards
(53 cards)
Why get away from water?
more efficient heart
Why get away from water?
amniotic egg
Why get away from water?
better excretory system
Now that reptiles are terrestrial they must…
conserve water
how do reptiles conserve water?
by producing a special nitrogenous waste - uric acid
how is the skin waterproofed?
by keratin which protects them from desecration
how do reptiles breathe?
via lungs
birds and mammals have completely separate ____ and ____ systems
pulmonary and systemic systems
amniotic egg
egg surrounded by extra-embryonic membranes
when did the amniotic egg first develop?
carboniferous era
characteristics of amniotic egg
leathery or birttle: mechanical support so they don’t collapse on land
characteristics of amniotic egg
permeable to gases: gas exchange
characteristics of amniotic egg
fairly impermeable to water
characteristics of amniotic egg
not present in therian mammals
why is allontois no longer needed in the mother’s womb?
because of the umbilical cord connecting the baby to the mom - mom gets rid of all the waste
Consequences of using terrestrial eggs
internal fertilization - sperm cannot penetrate the egg shell
Consequences of using terrestrial eggs
non-toxic nitrogen waste product is required (uric acid)
What do excretory organs do?
control concentration and composition of extracellular fluids and excrete waste
salts and ions are released by the
skin, gills, kidneys, or specilized glands
excretory products
salts
excretory products
ions
excretory products
water
excretory products
fecal matter released by digestive system
excretory products
nitrogenous wastes
