QUIZZES Flashcards
what is the psychological reason why the body sizes of organisms such as planarians and flukes are limited?
they dont have a acoelom.
what is the function of the followin g body structures?
pharynx,protonephridia
pharynx-feeding
protonephridia-excretion
difference between open and closed circulatory system
open is free flowing blood
closed has blood vessels, veins, tubes to transfer blood
what circulatory system is in annaleids
closed
what circulatory system is in mollusks
open
function of crop
stomach for annalids. stores rocks
function of gizzard
grind the food
function of gizzard
how they crush food
function ofparapodia
help with movement
function of clitellum
fatty band around worm. helps with reproduction. exchange egg and sperm.
function of nephridia
excretion
name 2 evolutionary reversals for most species in the class bivalvia
no head, cephalization, no radula
what are many species in the class bivalvia considered economically important.
they are an importsant food source
breifly explain why leeches can be used as benefit for modern western medecine
leeches saliva can help with blood clots
which class of mollusks demonstrate advanced cognition and the ability to solve puzzles
cephalapeda
a feeding structure found in many mollusks. can be used to scrape food from hard surfaces
radula
animals are thought to. have evolved from colonial animal like protists known as
choanoflagallates
2 most ancestral animals phyla
pnidaria, proifera
name 2 characteristiucs that all animals have
dna and lipids
bilateral symmetry
one plane of symmetry
radial symmetry
many planes of symmetry
example of radial symmetry is
jellyfish
most diverse group of animals
arthropods
evolutionary trend cephalization
senseory structures and nervous structures evolve towards anterior part of body
the entrance to the gastrula is
blastopore
blastopore becomes ___ in protostome animals
mouth
blastopore becomes ___ in deuterostome animals
anus
which germ layer is responsible for muscles
mesoderm
which germ layer is responsible for outside of skin
ectoderm
what is the ceolom
empty air filled/fluid filled space the seperates organs. prevents injury
if lacking coelom what constraint occurs on size
cant grow vertically but can grow longer