Ch 32 - Animal Diversity Flashcards
(21 cards)
Animals are
heterotrophs that ingest their food, multicellular eukaryotes
Animal bodies are held together by
structural proteins such as collagen in the extracellular matrix
Tissues
Groups of similar cells that act as a functional unit
Cleavage
Rapid cell divisions of the zygote after a sperm fertilizes an egg
Blastula
A multicellular, hollow animal embryo that forms after cleavage
Gastrula
A structure with multiple layers of embryonic tissue formed from a blastula
Larva
a sexually immature and morphologically distinct from the adult
Body Plan
a set of morphological and developmental traits
Radial Symmetry
Having no front and back or left and right
Bilateral Symmetry
Having a dorsal(top) side and a ventral(bottom) side
A right and left side
Anterior(front) and posterior(back) ends
ectoderm
the germ layer covering the embryo’s surface
Endoderm
the innermost germ layer and lines the developing digestive tube called the archenteron
Diploblastic
having an ectoderm and endoderm
Tripoblastic
having an intervening mesoderm layer; include all bilaterians
In protostome development
cleavage is spiral and determinate, mouth forms first
In deuterostome development
cleavage is radial and indeterminate, anus forms first
blastopore
forms during gastrulation and connects the archenteron to the exterior of the gastrula
Coelom
The main body cavity in most animals
Coelomates
animals that possess a true coelom
3 Major Clades of Bilaterians
Deuterostomia, Ecdysozoa, and Lophotrochozoa
Deuterostomia
includes hemichordates (acorn worms), echinoderms (sea stars and relatives), and chordates
