Unit 5 Part 2 Bio 2

Triploblastic

organism that has ectoderm, mesoderm, endoderm

Protostome

mouth is formed before anus

Chemoreceptors

on head, helps find prey (tastebuds)

Flame cells

Where nitrogenous waste is excreted (Platyhelminthes)(Turbellaria)

Cerebral Ganglia

precursor of brain, helps detect touch, water currents and chemicals.

Auricles

contains chemoreceptors to help locate food

Ocelli

eye spots that help detect light

Transverse Fission

How planarians reproduce asexually

Proglottids

long repeating units that contain reproductive structures

Regeneration

regeneration

Photoreceptive, Negative and positive

Move away from light (Negative), move towards light (Positive)

Zooids

Two new halves of a split planarian

Setea

grips the soil like sneakers, works together with muscles to move through soil

Parapodia

used for movement

Pharynx

main ingestive organ (Platyhelminthes)(Turbellaria)

Esophagus

passes into tube

Crop

temporary storage packet

Typhosole

folding which increases surface area of the intestine

Closed and opened circulatory system

closed system = blood in vessels

open system = blood everywhere

Aortic Arches

5 pair of muscular tubes that link ventral and dorsal vessels

Nephridia

eliminates cellular waste (Annelida)(Oligochaeta)

Clitellum

holds earthworms together during reproduction, sperm is injected into this

Cuticle

covers bodies and is made of collagen (Nematoda)