Biology- animal diversity vocab

Pseudocoelom

"false body cavity"—body cavity that is only partially lined with mesoderm

Invertebrates

Includes all animals that lack a backbone, or vertebral column

Exoskeleton

external skeleton, most made of calcium carbonate

Zygote

fertilized egg

Hydrostatic Skeleton

fluid within the gastrovascular cavity that can alter the animal's body shape by working with the contractile cells in the body wall

Deuterostomes

group of animals in which the blastopore becomes the anus, and the mouth is formed from the second opening that develops

Blastula

hollow ball of cells that develops when a zygote undergoes a series of cell divisions

Endoderm

innermost tissue layer; developed into the linings of digestive tract and much of the respiratory system

Kingdom Animalia

members are multicellular, eukaryotic, heterotrophic, cell membrane

Mesoderm

middle tissue layer; develops into muscles, and much of the circulatory, reproductive, and excretory systems

Acoelomate

no body cavity

Ectoderm

outermost tissue layer; produces sense organs, nerves, and outer layer of the skin

Endoskeleton

structural support system within the body

Molting

to increase in size, these organisms will break out of their exoskeleton and grow a new one

Cephalization

a developed head region—concentration of sense organs and nerve cells at the anterior end of the animal

Body cavity

a hole in the inside of a body that hold fluid.

Protostomes

an animal whose mouth is formed from the blastopore

Vertebrates

an animal with a backbone

Closed Circulatory System

blood circulated entirely within blood vessels that extend throughout the body (single loop and double loop circulation—humans (2 atria, 2 ventricles)

Open Circulatory System

blood is only partially contained within a system of blood vessels as it travels through the body

Coelom

body cavity lined with mesoderm

Radial Symmetry

body plan in which the organism can be divided into equal halves

Bilateral Symmetry

body plan in which the organism can be divided into left

Cartilage

connective tissue that supports the body and is softer and more flexible than bone

Metamorphosis

development process that leads to dramatic changes in shape and form—distinct larval and adult stage; (some cnidarians, insects, crustaceans, amphibians)