Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
23 Cards in this Set
- Front
- Back
|
Criteria for classification
|
newer information based on sequence of nucleotides in RNA and DNA
|
|
|
Organization of tissues
|
i) 2 embryological germ layers (true tissues): ectoderm and endoderm
ii) 3 embryological germ layers: ectoderm, endoderm, and mesoderm |
|
|
Radial Symmetry
|
divided around a central axis
|
|
|
Bilateral Symmetry
|
divided by a central plane into right and left portion
|
|
|
What kind of Digestive system?
|
Intracellular, which means digestion occurs within the cells
|
|
|
Saclike digestive system
|
One opening
|
|
|
Tubelike digestive system
|
two openings, mouth and anus.
|
|
|
What is the body cavity called?
|
Coelom
|
|
|
acoelomate
|
no body cavity
|
|
|
pseudocoelomate
|
body cavity is not completely lined with mesoderm
|
|
|
coelomate
|
body cavity completely lined with mesoderm
|
|
|
protostome
|
first embryotic opening
|
|
|
Deuterostome
|
glastopore becomes anus
|
|
|
Segmentation
|
Repitition of body parts.
Body divided into identical or nearly identical sections |
|
|
Characteristics of sponges (Phylum Porifera) (C A A N I)
|
-Cellular level of organization
-asymmetrical -acoelomate -no segmentation -intracellular digestion |
|
|
Where are collar cells located?
|
-They line the cavity and canals
|
|
|
What are they made of?
|
-microtubules that filter food from water
-Flagella create continuous water movement |
|
|
Epithelial cells
|
outer layer of sponge
|
|
|
ameoboid cells
|
between outside and inside of sponge
|
|
|
What are the functions of ameoboid cells?
|
-Carry food from collar cells to epithelial cells
-produce spicules - skeletal materal |
|
|
cnidocytes
|
cells containing containing nematocysts which attach and secrete toxin
|
|
|
2 true tissue layers of Cnidarians
|
-Ectoderm
-Endoderm mesoglea(jelly-like between the two) |
|
|
Characteristics of Cnidarians - Phylum Cnidaria
|
-Radial Symmetry
-Gastrovascular cavity -acoelomate -no segmentation -primitive nervous system |
