lecture 17 Flashcards
1
Q
5 key characteristics of chordates
A
a notochord
a dorsal hollow nerve cord
a post anal tail
pharyngeal slits
endostyle
2
Q
what is a notchcord?
A
a stiff fibrous rod that muscles work against during swimming
3
Q
what is a dorsal hollow nerve cord?
A
develops into the brain and spinal cord
4
Q
what does a post anal tail do?
A
facilitates locomotion in water and balance on land
5
Q
what do pharyngeal slits do?
A
allow filter feeding but evolved into gills in many chordates
6
Q
what do endostyles do?
A
assist in filter feeding but evolved into the thyroid in many chordates
7
Q
what is the primary function of the vertebral column/spine
A
to protect the nerve cord
also allows efficient movement
8
Q
what did amniotic eggs allow?
A
reptiles to lay eggs on land and eliminate the larvae stage
