Neuron - a specialized, impulse-conducting cell that is the functional unit of the nervous system,
consisting of the cell body and its processes, the axon and dendrites.
Axon - the appendage of the neuron that transmits impulses away from the c
Chapter 23 Chordates
Characteristics of Phylum Chordata
1. Bilateral symmetry; segmented body; three germ layers; well-developed coelom
2. Notochord (a skeletal rod) present at some stage in the life cycle
3. Single, dorsal, tubular nerve cord; anterior e
Epidermis - the outermost living layer of an animal, usually composed of one or more layers of cells.
Keratin - a scleroprotein or albuminoid substance, found in the dead outer skin layer, and in horn, hair,
feathers, hoofs, nails, claws, bills
Osmotic Conformers - organisms that tolerate large variations of internal ionic concentrations without
serious damage by remaining isosmotic with the water around them.
Active Transport - the movement of ions or molecules across a cellular memb
Suspension feeding - an animal that feeds on material (as planktonic organisms) suspended in
water and that usu. has various structural modifications for straining out its food.
Deposit feeding - an aquatic animal that feeds on small specks of