phylum cnidaria
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18 Terms
What trait first appeared in Phylum Cnidaria?
Tissues
Class Scyphoza
Jellyfish
Class Anthozoa
Sea anemones, and corals
importance of having tissues?
organ development, specialized structures
The two unique traits of Phylum Cnidaria
Radial symmetry, Cnidocytes (stinging cells with nematocysts)
Respiratory system
how oxygen enters and CO2 leaves
Digestive system
digests food that the organism eays and absorbs nutrients fromt the food
Circulatory system
curculates nutrients and gases thoughout the body
exectory system
expels wastes form the body
nevous system
allows the organism to sense the environmnet, nerve net acts a nervous system
What are three things that the gastrovascular cavity does in Cnidarians
Digestive, circulatory, excretory system
Do animals without formal organ systems still need to do the job of those systems?
Yes. Animals without organ systems still perform the same life functions (getting food, exchanging gases, removing waste, reproducing), but they do so using simple cells and tissues instead of specialized organs.
Cnidirans
Cnidarians do not have an anus. Food enters and wastes leave the same hole
simple diffusion
Movement of particles from high to low concentrations without a protien
Explain simple diffusion, and how Cnidarians depend on it for gas exchange
Cnidarians rely on simple diffusion because they have thin bodies and no respiratory system, so gases move directly between the water and their cells.
Describe the nervous system of Cnidarians
Understand the connection between mobility and having a nervous system
Cnidarians have a simple nerve net (no brain or spinal cord) that helps them sense their environment and coordinate movement. As animals become more mobile, they need more complex nervous systems to control movement and respond quickly to stimuli.
importance of corals
protect coastlines from waves, provide habitats and shelter, coral provide nitrogen
coral bleaching
when the corals is under stress it will expel its zooxanthelle (algae)