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Biology Classification > Definitions > Flashcards

Flashcards in Definitions Deck (13)
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1
Q

Acoelomate

A

Animals that lack an internal body cavity

2
Q

Coelomate

A

Animals that contain an internal body cavity

3
Q

Coelom

A

A fluid filled body cavity that supports organs

4
Q

Segmentation

A

The division of the body into repetitive sections

5
Q

Cephalization

A

An evolutionary trend where nervous tissue becomes concentrated toward the anterior end of an organism

6
Q

Mesoderm

A

The middle layer of cells found in most animals. In humans this layer produces muscles, blood, kidneys and reproductive organs.

7
Q

Endoderm

A

The inner layer of cells found in most animals. In humans this layer produces lung, liver, pancreas and bladder

8
Q

Ectoderm

A

The outer layer of cells found in most animals. In humans this layer produces skin, nerve tissue, and sense organs

9
Q

Polyp

A

A sessile body form of a cnidarian characterized by a cylindrical shape with tentacles extending upwards and outwards.

10
Q

Medusa

A

A motile body form of a cnidarian characterized by flattened form that has the mouth at the bottom with tentacles extending below the mouth

11
Q

Asymmetrical

A

Having an irregular body shape

12
Q

Radial Symmetry

A

A body plan that can be divided along several planes to produce 2 identical halves

13
Q

Bilateral symmetry

A

A body plan that can be divided along one plane to produce 2 identical halves