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chapter 29 biology

found in the water habitats some are on land; more than 100 thousand named species mollusks
has a true coelom body cavity
Fluid filled body cavity within the mesoderm coelom
Most have bilateral symmetry and many have 1 or more shells called valves mollusks
what are the organ systems in a mollusks circulatory; reparation; digestion; excretion
what are the 3 body plans of a mollusk muscular food; head; visceral mass
most breath with ciliated gills located in there mantle cavity respiration of a mollusk
space between the mantle and the visceral mass (central section that contains the bodies organs) mantel cavity
heavy fold of tissue that surrounds the visceral mass mantel
describe how mollusks breath constant beating of cilia causes a continuous stream of water to pass over the gills it may extract 50% or more of the dissolved oxygen from the water that passes over the gills
if mollusks lack gills mantle cavity functions as simple lung
How many chamber hearts does a mollusk have 3
What circulatory system does a mollusk have Open circulatory system
the blood leaks out of the blood vessel and bathes the body's tissues directly Open circulatory system
collect blood from gills 2 chambers
pumps oxygenated blood out of vessels into tissues where nutrients, oxygen and carbon dioxide are exchanged between blood and tissues. The blood returns to the heart by the gills. 3 chamber
_____and ____ are the exception, they have a closed circulatory system Octopi, squids
the blood never leaves the blood vessels the materials into and out of the blood by diffusing across the walls of the vessels Closed circulatory system
they use there coelom to collect waste laden body fluids excretion
used during excretion to collect the waste laden body coelom
nitrogen rich waste are filtered from the ceolimic fluid by tiny tibial structures called _____, this allows useful molecules to be removed before the waste is discharged. Found in all ceolimates except for Arthropods and chordates Nephridia
What class is Bivalves in Bivalvia
Class bivalvia has Sessile filter feeder 2 part hinged shell
non-moving Sessile filter feeder
No distinct head region nerve ganglia
the remnants of a simple brain, present above the foot nerve ganglia
basic sense organ, sensory cells along the edge of the clams mantel that respond to light and touch Rudimentary sense organs
they are secreted by the mantel Valves
protects the shell tough outer
hard calcium carbonate crystals that strengthen the shell the food laden mucus to the bivalves mouth Thick middle
smooth so it prevents damage to the bivalves soft body Smooth inner
the valves are connected with a hinge and two thick ____ ____, when they contract they cause the valves to close forcefully Abductor muscles
the bivalves use there muscular foot to dig down into the sand Muscular foot
they feed by sucking seawater through hollow tubes called Siphons
water is drawn through the _____ ______ over the gills and out the ______ ________ Incurrent siphon and excurrent siphon
because they are covered with a sticky mucus which traps small marine animals, protists, and organic material as water passes over Gills also trap pray
the food laden mucus to the bivalves mouth Cilia directs
they reproduce by shedding the sperm and egg into the water where fertilization occurs Sexual reproduction
They produce both eggs and sperms hermaphroditic
What class is gastropods in Gastropoda
Gastropods contain snails and slugs
Gastropods can be found in marine, fresh water, and terrestrial
have a Head, foot and visceral mass, they use the foot for locomotion Gastropods
the terrestrial species secretes mucus from the base of the foot, forming a slimy path to glide on Gastropods Mucus
most have a pair of tentacles where there eyes are located gastropods
Have a single shell Gastropods
for the aquatic species uses gills, the terrestrial species uses the empty mantel cavity as a primitive lung Respiration gastropods
many are herbivores eating plants or algae, they scrape the algae off the rocks with there radula Gastropods
a tongue like scraping organ radula
What class is Cephalopods in Cephalopoda
What is in the class Cephalopoda squids, octopi, cuttlefish, nautiluses
10 tentacles Squid
8 tentacles Octopus
80-90 nautiluse
they feed on fish mollusks, crestation, and worms, they pull the food into there mouth and they are bitten by strong beak like jaws, then the radula pulls the prey into the mouth Marine predators
draw water into there mantel cavity and expel through cyphon
___________which is when they quickly close the mantel cavity causing the water to forcefully leave the cavity and inking- they release a dark fluid to disguise there route of escape jet proportion
is an exception it has a shell nautilus
What phylum is Annelids Annelida
What is in phylum Annelida Segmented worms
-- have a body cavity —True coelom —Segmentation Annelida
thee external bristles are Setae
the marine Annelida have fleshy appendages called parapodia
the development of the anterior sense organs and brain, also the process of head development in bilaterally symmetrical animals Cephalization
(stomach side) nerve cord and pairs of segmental ganglia make coordinated movement of each body segment possible Ventral (bottom) nerve cord
modified into specialized regions: the crop, the stomach, and the intestine Digestive tube
annelids circulatory system Closed
in several segments they have enlarged blood vessels that serve as simple hearts, the earth worm has 5 pairs Earth worms
exchange oxygen/carbon dioxide through body surfaces- do not have gills, lungs, or special respitory organs Annelids respiration
What class is Parapodia in Polychaetes
occur on most of there segments, they actually have setae, used to swim burrow and crawl, has more surface area which makes for more efficient gas exchange between the animals and the water parapodia
are terrestrial earth worms and they literally eat there way through school class Oligochaete
all hermaphrodites- they all produce sperm and eggs parapodia reproduction
both circular and longitudinal muscles parapodia movement
defuses through the earth worms skin only if the worms skin is kept moist Sucker parapodia respiration
—Leeches —Flattened body —Coelom not segmented class Hirudinean
both ends of the body suckers
Created by: Lauren Bowers