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Lecture

BIOL 111 Vocabulary.doc


Department
Biology
Course Code
BIOL 111
Professor
Heather Roffey

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Lecture 10
Embryonic development part one
zygote
: diploid, union of haploid gametes
embryo
: young organism, contained in protective structure
cleavage
: cell division in zygote
gastrulation
: infolding of embryonic tissue layers
morula
: solid ball of cells, pre-gastrulation
blastula
: hollow ball, cells in exterior; pre-gastrulation
gastrula
: after infolding begins
blastopore
: invagination mouth (protosome), anus (deuterostome)
archenteron
: digestive space (gut cavity)
ectoderm
: outer layer epidermis, nervous tissue
mesoderm
: middle layer internal organs etc

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endoderm
: inner layer lining of respiratory, digestive systems
Cnidarians
blind gut
: digestive (gastrovascular) cavity - one opening
mesoglea
: gel, not tissue, structural support in cnidarians
polyp
: sessile form of cnidarians, mouth upward
medusa
: motile, mouth downward
cnidocytes
: cells that produce nematocysts, unique to cnidarians
nematocysts
: organelle, coiled tube prey, releases venom
nerve net
: in epidermis and gastrodermis, connected by mesoglea; connected neurons, no
brain
planula
: free-swimming, bilateral, ciliated larvae
Hydrozoa (class)
: polyp dominant - e.g. Hydra
Scyphozoa (class)
: jellyfish, medusa dominant, no velum
Anthozoa (class)

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: corals, anemones etc; polyp - no medusa
velum
: shelf under edge of bell, muscular; jellyfish lack this
coral bleaching
: zooxanthelle expelled, corals may die
Platyhelminthes
platyhelminthes
: flatworms, flat like a plat(e)
planarian
: specific family; cephalisation, mouth in middle of ventral side
cephalisation
: concentration of neurons, senses at anterior
Turbellaria (class)
: free-living (the only class)
Monogenea (class)
: flukes, parasites on fish gills
Trematoda (class)
: flukes, incl. Schistosoma
Cestoda (class)
: tapeworms, in vertebrate intestines
fluke
: flat body with suckers (body plan)
schistosomiasis
: human, snail host; unsanitary water
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