Lektion 2 - short version Flashcards
What are bilaterians?
animals with bilaterian symmetry (left right mirror images of each other)
Facts sponges?
Circulatory system:none
Respiratory system: none (gas exchange occurs by diffusion)
digestive system: intracellular digestion
Extremities: none
Skeleton type: simple skeleton made of spicules
Facts Cnidarian
Circulatory system:none
Respiratory system: none (gas exchange occurs by diffusion)
digestive system: incomplete ,Gastrovascular cavity (one opening for ingestionand egestion)
Extremities: Tentacles with cnidocytes (stining cells)
Skeleton type: Hydrostatic skeleton (some have exoskeletons ex corals)
Facts flatworms
Circulatory system:none
Respiratory system: none (gas exchange occurs by diffusion)
digestive system: incomplete, Gastrovascular cavity (one opening for ingestionand egestion)
Extremities: none
Skeleton type: none
Facts molluscs
Circulatory system:open cisrculatory system
Respiratory system: gills or lungs
digestive system: complete sigestive system
Extremities: typically a muscular foot , tentacles etc
Skeleton type: calcium carbonate shell
Facts annelids
Circulatory system: closed circulatory system
Respiratory system: through skin, some have gills
digestive system: complete sigestive system
Extremities: parapodia or setae (bristle like structures in som species)
Skeleton type: hydrostatic skeleton
Facts roundworms
Circulatory system:none
Respiratory system: none (gas exchange through diffusion)
digestive system: complete digestive system
Extremities: none
Skeleton type: hydrostatic skeleton
facts arthropods
Circulatory system:open cisrculatory system
Respiratory system: gills, tracheae or book lungs
digestive system: complete sigestive system
Extremities: jointed appendages (ex legs, antenna etc)
Skeleton type: exoskeleton
what are diploblastic animals
animals that develop from two primary germ layers during embryonic development: ectoderm and endoderm
What are triploblastic animals
animals that develop from three primary germ layers during embryonic development: ectoderm, mesoderm and endoderm
What is segmentation?
the division of an animals body into series of repetetive segments. May contains repeated structures like muscles, nerves and organs.
What is open circulation?
The blood is not contained within blood vessels instead the blood is puped by a heart into open body cavities where it directly bathes the organs.
What is an exoskelleton?
an external protective covering
What is a hydrostatic skeleton?
a supportive structure consisting of fluid filled cavity sourrounded by muscles
What is metamorphosis?
A significant treansformation in an animals development.
complete metamorphosis: egg, larva, pupa and adult
Incomplete metamorphosis: egg, nymph and adult
it alows animals to adapt to different environments or ecologicak roles in their development
