Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/36

Click to flip

36 Cards in this Set

  • Front
  • Back
INGESTION
eating other organisms or organic material that is decomposing
CLEAVAGE
a succession of mitotic cell divisions
BLASTULA
a multicellular stage which in many animals takes the form of a hollow ball; a hollow ball of cells
GASTRULA
the two-layered, cup-shaped embryonic stage
LARVA
a free-living, sexually immature form in some animal life cycles that may differ from the adult in morphology, nutrition, and habitat
METAMORPHOSIS
the resurgence of development in an animal larva that transforms it into a sexually mature adult
PARAZOA
members of the subkingdom of animals consisting of the sponges; lacking true tissues
EUMETAZOA
members of the subkingdom that includes all animals except sponges
RADIAL SYMMETRY
characterizing a body shaped like a pie or barrel, with many equal parts radiating outward like the spokes of a wheel; present in cnidarians and echinoderms
BILATERAL SYMMETRY
characterizing a body form with a central longitudinal plane that divides the body into two equal but opposite halves
VENTRAL
bottom side
DORSAL
top side
ANTERIOR
head end
POSTERIOR
tail end
CEPHALIZATION
an evolutionary trend toward the concentration of sensory equipment on the anterior end, the end of a traveling animal that is usually first to encounter food, danger, and other stimuli
GERM LAYER
three main layers that form the various tissues and organs of an animal body
ENDODERM
the innermost of the three primary germ layers in animal embryos; lines the archenteron and gives rise to the liver, pancreas, lungs, and the lining of the digestive tract
ECTODERM
the outermost of the three primary germ layers in animal embryos; gives rise to the outer covering and, in some phyla, the nervous system, inner ear, and lens of the eye
ARCHENTERON
the endoderm-lined cavity, formed during the gastrulation process, that develops into the digestive tract of an animal
MESODERM
the middle primary germ layer of an early embryo that develops into the notochord, the lining of the coelom, muscles, skeleton, gonads, kidneys, and most of the circulatory system
DIPLOBLASTIC
having two germ layers
TRIPLOBLASTIC
possessing three germ layers
ACOELOMATE
a solid-bodied animal lacking a cavity between the gut and outer body wall
PSEUDOCOELOMATE
an animal whose body cavity is not completely lined by mesoderm
COELOM
a body cavity lined competely with mesoderm
PROTOSTOME
a member of one of two distinct evolutionary lines of coelomates characterized by spiral, determinate cleavage, schizocoelous formation of the coelom, and development of the mouth from the blastopore
DEUTEROSTOME
one of two distinct evolutionary lines of coelomates characterized by radial indeterminate cleavage, enterocoelous formation of the coelom, and development of the anus from the blastopore
SPIRAL CLEAVAGE
a type of embryonic development in protostomes in which the planes of cell division that transform the zygote into a ball of cells occur obliquely to the polar axis resulting in cells of each tier sitting in the grooves between cells of adjacent tiers
DETERMINATE CLEAVAGE
a type of embryonic development in protostomes that rigidly casts the developmental fate of each embryonic cell very early
RADIAL CLEAVAGE
a type of embryonic development in deuterostomes in which the planes of cell division that transform the zygote into a ball of cells are either parallel or perpendicular to the polar axis, thereby aligning tiers of cells one above the other
INDETERMINATE CLEAVAGE
a type of embryonic development in deuterostomes, in which each cell produced by early cleavage divisions retains the capacity to develop into a complete embryo
SCHIZOCOELUS
the type of development found in protostomes; initially solid masses of mesoderm split to form coelomic cavities
ENTEROCOELOUS
the type of development found in deuterostomes; the coelomic cavities form when mesoderm buds form the wall of the archenteron and hollows out
BLASTOPORE
the opening of the archenteron in the gastrula that develops into the mouth in protostomes and the anus in deuterostomes
LOPHOPHORE
a horseshoe-shaped crown of ciliated tentacles used for feeding
TROCHOPHORE LARVAE
a larval stage shared by annelids and mollusks