Quiz 3 - Ch. 18 Flashcards
Animals
Eukaryotes
Do not have cell walls
Movement
Heterotrophs – mostly internal digestion
Multicellular – all except sponges have true tissues
Gametes (haploid cells) are unicellular
Radial Symmetry
regularly arranged and radiate from a central point (circle)
Bilateral Symmetry
2 symmetrical halves
Coelom
“body cavity”
Acoelomate
“no body cavity”
Pseudocoelomate
false body cavity; not completely lined w/ muscle
Coelomate
true body cavity; lined w/ muscle
3 Tissue Layers
Ectoderm, Mesoderm, Endoderm
Ectoderm
outside; blue; Ex: skin
Mesoderm
middle; red; Ex: muscle/blood
Endoderm
inside; yellow; Ex: digestive tract
Protosomes
mouth forms first
Deuterostomes
mouth forms second
Cnidaria
Radial Symmetry
2 tissue layers
stinging cells
ex: Jelly fish/Sea Anemone
Platyhelminthes
Bilateral Symmetry
often parasites
3 tissue layers
acoelomate
ex: Planaria, tapeworms, flukes
Nematoda
Pseudocoelomate
bilateral symmetry
3 tissue layers
often parasites
ex: round worms
Mollesca
Soft bodied, some have hard shells
bilateral symmetry
complete digestive tract and circulatory system
3 tissue layers
ex: snails, squid, oysters, etc.
Annelida
Segmentation (allows for greater movement and flexibility)
coelomate
3 tissue layers
ex: earthworms, leaches, etc.
Arthropoda
head, thorax, and abdomen
bilateral symmetry
3 tissue layers
ex: insects, crustaceans, aracnids, etc.
Echinoderms
Deuterostomes
bilateral symmetry
3 tissue layers
ex: starfish, sea urchins, sand dollars, etc.
Chordata
dorsal hollow nerve chord
notochord (directs development of dorsal hollow nerve cord)
post-anal tail
pharyngeal gill slits
(ex: us!!… and a lot of other stuff)
