Unit II: Bilaterial Intro Flashcards
1
Q
What are the traits of common ancestor seen in Bilateria?
A
- Bilateral symmetry
- Complete digestive tract with mouth and anus
- Cephalization
- Central nervous system
- Triploblast embryos
- Coelom (lost or reduced)
2
Q
Cephalization
A
Evolution of the head (anterior) region where feeding, sensing environment, and information processing is concentrated
3
Q
Bilateral central nervous system
A
Neurons clustered into one or more tracts through body
- Ganglia
4
Q
Ganglia
A
a mass of neurons in a centralized nervous system
5
Q
Ectoderm
A
Skin and nervous system
6
Q
Endoderm
A
Lining of the digestive tract
7
Q
Mesoderm
A
Circulatory system, muscle, internal structures
8
Q
Coelom
A
fluid-filled cavity that separates the ectoderm from the endoderm
9
Q
Hydrostatic skeleton
A
gives support and allows movement for soft-bodies animals without limbs/fins
