Sbi3U~Module12~Invertebrates~11.1-- P2

Front 1

Fancy Name for body cavity?

Back 1

Coelom (Just in case you didn't get that from Part 1)

Front 2

Peritoneum

Back 2

A covering membrane that lines the body cavity and covers the internal organs

Front 3

Less complex invertebrates

Back 3

May lack a coelom or may have an intermediate structure called a pseudocoelom

Front 4

Pseudocoelom

Back 4

A fluid-filled cavity that lacks the mesodermal lining of a true coelom

Front 5

Acoelomates, such as flatworms

Back 5

Lack a body cavity.

Front 6

Pseudocoelomates, such as roundworms,

Back 6

Do not have a continuous peritoneal lining.

Front 7

Coelomates, such as the higher invertebrates and vertebrates,

Back 7

Have a true coelom lined with a continuous peritoneum.

Front 8

The development of a coelom was probably associated, at least in part...

Back 8

With an increase in animal size. As a solid structure increases in volume, the exchange of gases, food materials, and waste is less easily accomplished, and the folding of different organs to increase the surface area is somewhat restricted.

Front 9

Having a body cavity allows space for internal organs such as lungs, heart, stomach, and intestine

Back 9

To expand and contract and to slide by each other as the animal moves.

Front 10

Examples of Animals that display radial symmetry

Back 10

Hydra, jellyfish, and starfish

Front 11

Bilateral symmetry

Back 11

(bi meaning two) if one half of a shape is the
mirror image of the other half.

Front 12

Radial symmetry

Back 12

If the shape of one part is repeated a number
of times about a central axis

Front 13

Cephalization

Back 13

(from the Latin cephalicus , meaning head) The concentration of nerve tissues and receptors at the anterior end of an animal's body

Front 14

Only animals that display bilateral symmetry

Back 14

Have a true head region

Front 15

The invertebrates comprise

Back 15

95% of all the described animal species on Earth

Front 16

Sessile

Back 16

Not capable of independent movement. Sessile animals remain fixed in one place throughout their adult lives.

Front 17

Motile

Back 17

Capable of movement. Motile animals are able to move from place to place by expending cellular energy