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BIOL 1010 Lecture 11

Intro to Animals, Sponges


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Somatic cells
any cell in multicellular organism except an egg or sperm
Hox complex
(hemeobox genes) control development along long axis of body; regulate expression of hierarchy of other genes that control development of body parts along the front- back axis
One of the three primary (embryonic) germ layers formed during gastrulation. Mesoderm ultimately forms 'middle' structures such as bones, muscles, blood vessels, heart, kindeys, etc.
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
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
fluid-filled body cavity that develops between the mesoderm and endoderm
fluid-filled body cavity completely surrounded by mesoderm
Have no tissues, no organs and most have no symmetry - name means pore-bearers
suspension feeding
Aquatic organisms that collect suspended food particles from the surrounding water; particles may be filtered or taken by other methods.
phylum porifera
sponges; sessile (attached at base; don't move); glass, carbonate, or protein fibbers for support; 2 layers separated by gelatinous region; filter feeders; body with pores
specialized cells lining the interior surface of the radial canals which trap small food particles with their flagella and engulf them through phagocytosis
the "do-all" cells of sponges, moving by means of pseudopodia, they digest and distribute food, transport oxygen, and disposes of waste. they manufacture the fibers that make up a sponges skeleton
A large opening on a sponge through which filtered water is expelled
describes an organism that remains attached to a surface for its entire life and does not move

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