Module 11 Vocabulary Flashcards
Gemmule
A cluster of cells encased in a hard spicule -reinforced shell
Medusa
A free-swimming cnidarian with a bell-shaped body and tentacles.
Visceral hump
A hump that contains a mollusk’s heart, digestive, and excretory organs
Foot
A muscular organ that is used for locomotion and takes a variety of forms depending on the animal
Mantle
A sheath of tissue that encloses the vital organs of a mollusk, makes the mollusk’s shell, and performs respiration.
Circulatory system
A system designed to transport food and other necessary substances throughout a creature’s body.
Nervous system
A system of sensitive cells that respond to stimuli such as sound,touch,and taste
Invertebrates
Animals that lack a backbone
Vertebrates
Animals that possess a backbone
Spherical symmetry
An organism possesses spherical symmetry if it can be cut into two identical halves by any cut that runs through the organism’s center.
Radial symmetry
An organism possesses radial symmetry if it can be cut into two identical halves by any longitudinal cut through its center.
Bilateral symmetry
An organism possesses bilateral symmetry if it can only be cut into two identical halves by a single longitudinal cut along its center which divides it into right and left halves.
Epidermis
An outer layer of cells designed to provide protection
Mesenchyme
The jellylike substance that separates the epidermis from the inner cells in a sponge
Collar cells
Flagellated cells that push water through a sponge