Animals can be Categorized by Morphological Characteristics Flashcards
What are the three types of symmetry?
Asymmetry, radial symmetry, and bilateral symmetry.
What is asymmetry?
No symmetry in body plan (I.e sponges).
What is radial symmetry?
Can be divided along any plane, through a central axis, into roughly equal halves (I.e corals and sea stars).
What is bilateral symmetry?
Can be divided along only one plane, through the central axis, into equal halves.
Have a dorsal (top) side and a ventral (bottom) side, a left/right side, and an anterior (head) and a posterior (tail) end (I.e humans).
What are tissues?
Group of similar cells that is specialized to perform a specific task.
What happens during gastrulation in animal embryos?
The animal embryo becomes layered, and these layers eventually become different tissues and structures of the animal’s body.
What does the ectoderm develop into?
The skin and nervous system.
What does the mesoderm develop into?
Muscle and connective tissues, as well as the circulatory, excretory, and reproductive systems.
What does the endoderm develop into?
The digestive and respiratory systems.
Do sponges undergo gastrulation?
No, sponges do not undergo gastrulation and lack true tissue.
What type of tissue do corals and jellyfish have?
True tissue but only have two germ layers (endoderm and ectoderm).
These animals are diploblastic.
What type of tissue do most animals have?
True tissues and possess all three germ layers.
These animals are triploblastic.
What is the coelom?
A fluid-filled body cavity in which organs are suspended.
Why is the coelom important?
It helps movement and allows for the development of more complex organ systems.
How does the coelom form?
From tissues derived from mesoderm, so most triploblastic animals are coelomates.
