EOCT REVIEW. Animals. PORIFERA. Asymmetrical Filter Feeder (collar cells, choanocytes, capture food with flagella) Amoebocytes are cells that digest and circulate nutrients Spicules made of CaCO 3 or SiO 2 give support Wastes diffuse through the cell membrane. Coral - polyp form.
Coral - polyp form
Jellyfish - medusa form
Hydra - polyp form
Sea Anemone - polyp form
Open circulatory system - blood is pumped by a simple heart into vessels which empty into sinuses, into gills, back into the heart. Works well for slow moving animals like clams and snails
Faster moving mollusks (Octopi and relatives) have a closed circulatory system - blood remains in vessels. Transports blood faster.
Mantle covers most of the body and secretes shell. Shell is made of calcium carbonate.
Bivalves have two shells
Univalves have one shell
Metabolic waste is in the form of ammonia.
Nephridia remove ammonia from the blood and release it outside the body.
Complete digestive tract.
Open circulatory system - blood does not carry oxygen
Tracheal tubes carry oxygen. Air enters and leaves through spiracles.
Spiders have book lungs. Horshoe crabs have book gills
Aquatic arthropods have gills
Exoskeleton made of chitin
Malpighian tubules are saclike organs that extract wastes from the blood and then add them to feces that move through the gut.
Aquatic arthropods wastes diffuse from cells into water.