Phylum Chordata Flashcards
(34 cards)
What four features are Chordates associated with?
- Notochord
- Dorsal Nerve Cord
- Pharyngeal Slits
- Post-Anal Tail
What is a Notochord?
Longitudinal rod made of cartilage
The notochord runs between the
Nerve cord + digestive tract
What is the Notochord replaced by in vertebrates?
Vertebral column in vertebrates
What is the Dorsal Nerve Cord?
Bundle of nerve fibers that connects brain to muscles + other organs
What is the Post-Anal Tail?
Extension of the body beyond anus
What allows for the Post-Anal Tail to provide locomotion?
Skeletal muscles
What are Pharyngeal Slits?
Openings that connect mouth and throat
What is the purpose of the Pharyngeal Slits?
They allow for entry of water through the mouth without entering digestive system
What kind of symmetry to chordates exhibit?
Bilateral symmetry
How many tissues do chordates have?
Three, making them triploblasts
What is the level of organization displayed by Chordates?
Organ-system level
Chordates respire either with
Gills or lungs
Chordates excrete via
Intestines or kidneys
Class Chondrichthyes consists of
Sharks and Rays
Chondrichthyes have flexible endoskeletons made of
Cartilage
Class Osteichthyes consists of
Bony fish
Class Osteichthyes are fish with bony skeletons and
Scales
Class Osteichthyes possess a swim bladder for
Buoyancy control
Class Amphibia consists of
Frogs, toads, salamanders, newts
How do Amphibians respirate?
Through their skin
How can gills transform their respiratory system?
Aquatic larval stage has gills, which turn into lungs via Metamorphosis
How is the fertilization + development of Amphibians?
External
How does the heart transform for amphibians?
Larval stage maintains 2 chambers, whereas adult stage has 3
