Ch 34 Chordates - Reptiles Flashcards
(62 cards)
Amniotes
Tetrapods that have an amniotic egg
Amniotic eggs provide what?
A self-contained aquatic environment for development
Amniotic eggs allowed what?
Tetrapods to become fully terrestrial
Amnion
Encloses the amniotic fluid
Purpose of the amnion
It cushions and buffers the embryo
Yolk
Nutrients for the embryo
Chorion
Outermost membrane
Permeable to O2 and CO2
Allantois
Respiratory membrane enclosing a storage space for metabolic waste
Shell
Porous, protective enclosure
Purpose of the shell
Reduces water loss
Living reptiles include what three groups?
1) Turtles
2) Lepidosaurs
3) Archosaurs
Reptile advantages
1) More developed lungs
2) More protective skin
3) High-pressure circulatory system
4) Water-conserving excretory system
5) More forceful jaws
6) More complex nervous systems
More developed lungs
1) More surface area that amphibian lungs
2) More efficiently filled
How are reptile lungs more efficiently filled?
By the creation of negative pressure in the thoracic cavity
More protective skin
Reptile skin is comprised of a basal layer and outer layer
Basal layer of reptile skin
Thick, padded dermis
Outer layer of reptile skin
Lipid containing, hydrophobic epidermis
Water-conserving excretory system
Excrete waste as a relatively non-toxic uric acid tat is voided without loss of water
More forceful jaws
Reptile jaws are more efficient in biting, crushing, and grinding
More complex nervous system
Enlarged cerebrum
Benefit of enlarged cerebrum
Supports advanced coordination and integration of sensory information
Turtle shells are composed of what two things?
1) Dorsal carapace
2) Ventral plaston
What covers the turtles shell?
An outer keratin layer over an inner layer of bone
Turtle feeding
Carnivores, herbivores, omnivores
