Animal Characteristics Flashcards
How many species of existing animals have been identified?
1.3 million
Movement: Sessile def and example
attached and non-moving; sponges
Movement: sedentary def and example
move very little
clam
Movement: motile def
animals that can move
What do all animals have to provide energy for movement?
muscular tissue
What is a zygote and what does is form?
- fertilized eggs that undergoes rapid cell divisions called cleavage.
- it forms hollow ball of cells called blastula
Sperm + Cell = ?
Zygote
What is a blastocoel and how many germ layers does it have?
center cavity of blastula
1 germ layer
What is the germ layer of a blastocoel called?
blastoderm
What is the opening of a blastula called?
blastopore
What is the center/primitive gut of a blastula called?
an archenteron
Process of embryonic development
zygote - blastula - gastrula
Body Cavities: a blastopore may become what?
the mouth or the anus
Body Cavities: examples of protostomes
mollusks, anthropoids, annelids
Body Cavities: examples of deurterostomes
echinoderms and vertebrates
Germ Layers: what do they form and which organism does not have them?
form tissues, organs, and systems
not present in sponges
Ectoderm layer: which layer? what does it form?
outer layer
forms skin, nerves, sense organs
Endoderm layer: which layer? what does it form?
inner
digestive tract, liver, and lungs
Mesoderm: which layer? what does it form?
middle
muscles and other organs between digestive tract and outer covering
Coelem: definition
body cavity in bilaterally symmetrical animals
Coelem: internal body cavity fully lined with what?
mesoderm
Acoelomate’s definition and examples
have solid bodies filled with cells
sponges, cnidarians, flatworms
Pseudocoelomates definition and examples
have functional body cavity NOT fully lined with mesoderm
roundworms
