Chapter 15 Vocabulary
animal without a backbone.
body plan in which two halves of an organisms body are minor images of each other.
SYMMETRY-a body plan in which the parts of the body are arranged in a circle around a central point.
of nerve cells.
pouch where food is digested in animals.
cavity in the body of some animals where the guts and organs are located.
CIRCLUTORY SYSTEM-a circulatory system consisting of a heart that pumps blood thought spaces called sinuses.
CIRCULATORY SYSTEM-a circulatory system in which a heart circulates blood through a network of vessels that forms a closed
10.SEGEMENTS-one of many identical or almost identical repeating
11.EXOSKELETON-an external skeleton made of protein and chit tin; found on arthropods.
12.COMPOUND-an eye that is made of many identical, light-sensitive cells that work together.
13.ANTENNA-feelers on an arthropods head that respond to touch, taste, or, smell.
14.Mandible-a jaw found on some arthropods.
15.Metamorphosis- the process in which an insect or other animal change form as it develops from an embryo or
larva to an adult.
16.Endocrine-an internal skeleton.
17.Water Vascular System- a system of water pumps and canals found in all echinoderms that allow them to move,
eat, and breathe.