Class 4 Flashcards
What are the 3 types of summetry
Radial
Bilateral
Asymmetry
What is torsion
Twisting of organs to the other side
What is radial symmetry
Radial symmetry is obtained when a cut is done at any plain passing through the central axis from oral to aboral end
Ex ctenophora and cnidarians
What is radial symmetry also known as
Monoaxial heteropolar symmetry
What is bilateral symmetry
When only one plane is cut from anterior to posterior
What symmetry does larva of pila globosa show
Bilateral
What symmetry does an adult pila globosa show
Asymmetry
What organisms show asymmetry
Protozoan
Sponge
Pila globosa
What is cephalization
Formation of head which involves accomodation of neurons and sensory cells
What is coelom
Cavity present between the body wall and alimentary canal
What are the types of coelom
eucoelom
Acoelom
Psuedocoelom
What is Eucoelom
When the coelom is lined with a mesodermal lining
Annelida to chordata
What is Acoelom
Where mesenchymal cells occupies the coelom fluid causing it to be solid
Ex platyhelminthes
Tape worm
What is psuedocoelom
Where there is no mesodermal lining surrounding the coelom but mesodermal pouches instead
What is anatomy
Study that deals with internal organs
What is integumentary system
System that deals with the body wall
What are the layers of the body wall
Skin : acts as a physical barrier not allowing pathogens to enter
Dermis
Glands
There are 2 types of glands
Sweat
Sebaceous : sebum
