Lecture 3- Body Plans Flashcards
Body Plan
Structural design of an animal or parts of an animal
What defines an animals functional capabilities and limits?
Body plan
When do body plans begin to develop?
Early in embryonic life
Are there relatively many or few types of body plans?
Few because of evolutionary and developmental constraints
What are the basic animal requirements? (5)
Food- acquire, digest, metabolize
Nutrients- distribute
Oxygen- obtain and circulate
Metabolic waste- get rid of and undigested materials
Reproduce- awooga
Symmetry
Regular arrangement of body structures relative to a body axis
What are types of symmetry? (3)
Asymmetrical
Radially symmetrical
Bilaterally
Radial symmetry and example
One main axis
Similar halves
Common in sessile animals and planktonic animals
Xestospongia
Biradial symmetry and example
Two planes of sectioning
Epiactis
Who has quadriradial symmetry?
Jellyfish
Who had pentaradial symmetry?
Many Echinoderms
Where is the axis when a gut is present?
From the oral surface to the aboral surface
Bilateral symmetry
Body parts oriented about single medial axis from anterior to posterior
In animals with controlled mobility
Anterior end confronting the environment first
Concentration of sensory and feeding structures at anterior end
Transverse plane
Fuck I don’t know
Cross section shut up
Cephalization
When the sense organs are concentrated at the anterior end of the body
(Forms head or brain)
