1
it is the thick column of nerve tissue that extends from the base of the brain about two thirds of the way down the backbone
2
the portion of the alimentary canal extending from the stomach to the anus
3
a blood vessel that carries blood away from the heart
4
it is the mass of nerve tissue located in the head of animals with spinal cords; it is the center of thought and controls movement
5
it is the organ that controls the flow of blood in the body
6
a blood vessel that carries depleted blood back to the heart
