Lab 7

Question 1

Abdomen

Answer 1

Constitutes the part of the body between the thorax (chest) and pelvis, in vertebrates.

Question 2

Acoelomate

Answer 2

A solid-bodied animal lacking a cavity between the gut and outer body wall.

Question 3

Bilateral Symmetry

Answer 3

Body symmetery in which a central longitudinal plane divides the body into two equal but opposite halves.

Question 4

Body Cavity

Answer 4

A fluid or air filled space between the digestive tract and the body wall.

Question 5

Body Plan

Answer 5

In animals, a set of morphological and developmental traits that are integrated in a functional whole - the living animal.

Question 6

Cephalization

Answer 6

A evolutionary trend toward the concentration of sensory equipment at the anterior end of the body.

Question 7

Cephalothorax

Answer 7

The fused head and thorax of spiders and other chelicerate arthropods.

Question 8

Chemotaxis

Answer 8

Movement of a plant or animal in response to a substance or chemical.

Question 9

Coelom

Answer 9

A body cavity lined by tissue derived only from mesoderm.

Question 10

Diploblastic

Answer 10

Having two germ layers.

Question 11

Ectoderm

Answer 11

The outermost of the three primary germ layers in animal embryos; gives rise to the outer covering and, in some phyla, the nervous system, inner ear, and lens of the eye.

Question 12

Endoderm

Answer 12

The innermost of the three primary germ layers in animal embryos; lines the achenteron and gives rise to the liver, pancreas, lungs, and the lining of the digestive tract in species that have these structures.

Question 13

Eumetazoa

Answer 13

Member of a clade of animals with true tissues. All animals except sponges and a few other groups are eumetazoans.

Question 14

Germ Layer

Answer 14

One of the three main layers in a gastrula that will form the various tissues and organs of an animal body.

Question 15

Gravitaxis

Answer 15

Movement of a plant or animal in response to gravity.

Question 16

Mesoderm

Answer 16

The middle primary germ layer in a triploblastic animal embryon; develops into the notochord, the lining of the coelom, muscles, skeleton, gonands, kidneys, and most of the circulatory system in species that have these structures.

Question 17

Metamerism

Answer 17

Having a linear series of body segments fundamentally similar in structure, though not all such structures are entirely alike in any single life form because some of them perform special functions. In animals, metameric segments are referred to as somites or metameres.

Question 18

Phototaxis

Answer 18

Movement of a plant or animal in response to light.

Question 19

Pseudocoelomate

Answer 19

An animal whose body cavity is lined by tissue derived from mesoderm and endoderm.

Question 20

Radial Symmetry

Answer 20

Symmetry in which the body is shaped like a pie or barrel (lacking a left side and a right side) and can be divided into mirror-imaged halves by any plane through it’s central axis.

Question 21

Rheotaxis

Answer 21

Movement of a plant or animal in response to water current.

Question 22

Tagmatization (tagmata)

Answer 22

The grouping and fusion of adjacent metameres into larger functional units, tagma, responsible for performing specialized tasks.

Question 23

Taxis

Answer 23

An oriented movement toward or away from a stimulus.

Question 24

Thermotaxis

Answer 24

Movement of a plant or animal in response to temperature.

Question 25

Thigmotaxis

Answer 25

Movement of a plant or animal in response to touch or pressure.

Question 26

Thorax

Answer 26

The part of the body of a mammal between the neck and the abdomen.

Question 27

Triploblastic

Answer 27

Possessing three germ layers; the endoderm, mesoderm, and ectoderm. Most eumetazoans are triploblastic.