Invertebrates Chapter 11

Invertebrates

Sponges

Cnidarians

Echinodermes

Worms

Mollusks

Arthropods

Have a stinging cell and they take food into their bodies

Body Structure with no body symmetry and no tissues but the y have cells with special funtions

internal skeleton and water vascular system

Big narrow bodies without legs; with a head/tail with bilateral symmetry; tissues, organs, body systems and a brain

Collar Cells-whiplike cells that move H2O

Pores-move water into the central cavity

Jelly Like Cells-digest and distribute food

Spike-support and protect

sexual reproduction-have both sexes

Polyp-mouth opens at the top; tendrils around mouth for attaching to something-reproduce asexually

Medusa-bowl shaped; mouth opens downward; made for swimming; reproduces sexually

Ex. Coral and hydra

jelly fish

Characteristics-live in salt water; body parts come in multiples of five; hardened plates of skin stretched over and internal skeleton that provides support

4 Types:

Sea Stars

Brittle Stars

Sea Urchins

Sea Cucumbers

Water Vascular

System-internal organ system of fluid filled sacs; tubes squeeze the force of water into feet which helps the echinoderms move

reproduce sexually and they are both male and female

Flat-flat bodies-parasites, ie tapeworms and flukes

Round-cylinder bodies-tiny; one way-enclosed; ie. hookworms

Segmented-made from segments with digestive system and well developed; closed circulatory system; ie. earthworms