Biology Flashcards

Front

Hydrostatic skeleton

Back

A fluid-filled internal cavity surrounded by muscle tissue.

Front

Exoskeleton

Back

Thick hard outer covering that protects and supports an animal's body.

Front

Nerve net

Back

A netlike control system that sends signals to and from all parts of the body.

Front

Endoskeleton

Back

Internal support structure.

Front

Undulation

Back

The wavelike motion of some animals.

Front

Gills

Back

An organ that exchanges carbon dioxide for oxygen in water.

Front

Spiracles

Back

Tiny holes on the surface of an organism where oxygen enters the body and carbon dioxide leaves the body.

Front

Diffusion

Back

The movement of substances from an area of higher concentration to an area of lower concentration.

Front

Closed circulatory system

Back

A system that transports materials through blood using vessels.

Front

Open circulatory system

Back

A system that transports blood and other fluids into open spaces that surround organs in the body.