chapter 32 Flashcards
Extra cellular matrix
A complex mesh work of proteins and polysaccharides secreted by animal cells and in which they are embedded.
Animal
A member of a major lineage of eukaryotes whose member typically have a complex, large, multicellular body, eat other organisms, and are mobile.
Neuron
A cell that is specialized for the transmission of nerve impulses. Typically has dendrites, a cell body, and a long axon that forms synapses with other neurons.
Heterotroph
Any organism that cannot synthesize reduced organic compounds from inorganic sources and that must obtain them by eating other organisms
Model organism
An organism selected for intensive scientific study based on features that make it easy to work with, in the hope that findings will apply to other species.
Phylum
A taxonomic category above the class level and below the kingdom level.
Body plan
The basic architecture of animals body, including the number and arrangement of limbs, body segments, and major tissue layers.
Ganglion
A mass of neurons in a centralized nervous system
Central nervous system
The brain and spinal cord a vertebrate animals.
Brain
A large mass of neurons located in the head and region of an animal, that is involved in information processing.
Cephalization
The formation of a distinct anterior region (the head) where sense organs in the mouth are clustered
Sessile
Permanently attached to a substrate, not capable of moving to another location
Choanocyte
A specialized flagellate feeding cell found in choanoflagellates and sponges.
Choanoflagellates
Protists that are the closest living relatives of animals.
Lophotrochozoans
A major lineage of protostomes that grow by extending the size of their skeletons rather than by molting.
