Bio Chp 27 Warm Up 2
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What are two things sponges don't have that animals do?
tissues or organs
What key property of all animal cells do sponge cells have?
Give example of cell recognition.
When you grate of pieces of a sponge they will form back together
What is the typical sponge shape?
Bulbous (rounded) with a circular opening at the top called the osculum
What is teh osculum?
The circular opening at the top of a sponge that is its excurrent channel
What are porocytes?
Tiny pores that extend into the sponges interior cavity of which water and nutrients enters into the sponge through
What is the atrium?
Sponge's interior cavity
What are chaonocytes?
Special cells lining the atrium where the flagella are found on
What does the flagella do to circulate water?
Whip, so that the water goes in a circular motion entering the porocytes and exiting the osculum
What are brought in with the water?
What is excreated?
Carbon Dioxide and Waste
How do sponges digest food particles?
They are trapped in the collar of the choanocytes and later ingested bythem and passed on to other cells
Because sponges haven't changed, they lack?
- A nervous system
- A muscle system
- A digestive track
- Tissues or organs
Explain the flow of water and nutrients into and out of a sponge.
Water and nutrients enter in through the porocytes and food particles are trapped in the collars of the choanocytes. By the whipping of the flagella, waste is then flushed out the osculum.
What are eumetazoans? Examples
- Animals that have both tissues and symmetry, called "true animals"
- All animals except sponges
What three distinct cell layers that give rise to the many tissues of the adult body do the embryos of eumetazoans develop?
- An outer layer, ectoderm: gives rise to skin and nervous system
- A middle layer, mesoderm: gives rise to the skeleton and muscles
- An inner layer, endoderm: gives rise to the digestive organs
What are the oldest eumetazoan (most primitive) phyla?
What does teh phylum Cnidaria include?
- sea anemones
What does the minor phylum Ctenophora include?
What type of symmetry do cnidarians and ctenophores have?
What is radial symmetry?
Where there are many lines of symmetry
What are cnidarians and how do they eat?
Carnivores that capture their prey with tentacles that surround their mouth
What are cnidocytes?
Stinging cells in the tentacles
The tentacles bear stinging cells called?
What is a nematocyst?
A small barbed harpoon in each cnidocyte to spear prey
When does the nematocyst spear the prey?
When an animal set off the trigger
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