Echinoderm General characteristics Flashcards Preview

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Flashcards in Echinoderm General characteristics Deck (23)
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1
Q

type of symmetry adults exhibit

A

5 sided pentaradial symmetry

2
Q

do they have a skeleton? Where is it located

A

internal (except in sea urchin)

3
Q

describe the skeleton of urchins and sand dollars

A

fused plates which makes them rounded

4
Q

what type of vascular system

A

water vascualr

5
Q

where do the spines protrude from

A

plates

6
Q

examples of echinoderms

A

seastars, brittle stars, sea urchins, sea cucumners

7
Q

describe the water vascular system

A

internal network of fluid filled canals connected to tube feet

8
Q

importance of teh water vascular system

A

feeding, internal transport, excretion

9
Q

describe how the water vascular system works

A

enters through madriporite ->into ring canal -> into tube feet

10
Q

why does the vascular system work like a hydraulic pump

A

when water pushes into the tube foot, it expands. when water is pulled out, it contracts.

11
Q

The side that the mouth is on is called what

A

oral surface

12
Q

describe carniverous echinoderms

A

the sea stars

open shells, expells stomach into shell, excretes enzymes to digest, pulls back stomach

13
Q

descrieb herbivorous echinoderms

A
the sea urchens 
uses jaws (aristotles lantern) to scrape and chew algae
14
Q

describe the detrivourous echinoderms

A

sea cucumbers

15
Q

how do echinoderms respire

A

diffusion through thin-walled tube feet

some species have gills

16
Q

describe the circulatory system

A

not well developed

distribution of nutrients in coelomic cavity

17
Q

what is the coelomic cavity

A

part of the water vascular system

18
Q

how do echinoderms excrete waste

A

solid waste expelled through tube feet (except in brittle stars)

19
Q

do echinoderms have a brain

A

no

20
Q

what kind of sensory systems do echinoderms have

A

nerve ring which surrounds mouth
radial nerves that travel down each arm below the vascular canals
sensory cells to detect food (chemical stimuli)
statocysts for balance
ocelli to detect light/dark

21
Q

how does the reproduction work

A

ovaries or testies in radial segments (openings between arms)
broadcast fertilization -> stimulated others to release

22
Q

describe the larvae

A

free-living, bilaterally symmetrical

part of plankton

23
Q

importance of echinoderms

A

controls populations of other animals and algae

research of embryological developement