Animals pt 1

Question 1

anterior

Answer 1

head region

Question 2

posterior

Answer 2

tail region

Question 3

dorsal

Answer 3

back or top

Question 4

ventral

Answer 4

abdomen or bottom

Question 5

Symmetry

Answer 5

Balance in body proportions

Question 6

Asymmetrical Symmetry

Answer 6

Irregular Shape

Question 7

Radial Symmetry

Answer 7

Can be divided along any plane to produce 2 equal halves

Question 8

Bilateral

Answer 8

Can be divided only one way to produce mirror image halves

Question 9

Body Development

Answer 9

As embryo develops, 3 germ layers form

Question 10

3 germ layers form in body development

Answer 10

Ectoderm, Mesoderm, Endoderm

Question 11

Ectoderm

Answer 11

becomes nervous system, epidermis of the skin, pituitary, lens of eye

Question 12

Mesoderm

Answer 12

becomes muscles, skeleton, notochord, circulatory system, kidney, reproductive system

Question 13

Endoderm

Answer 13

becomes lining of digestive tract, liver, pancreas, epithelial lining of lungs, many endocrine glands

Question 14

Examples of Acoelmates

Answer 14

sponges, cnidarians, & flatworms

Question 15

Pseudocoelmates

Answer 15

partial body cavity lined with mesoderm

“Tube within a tube” body plan

Question 16

Example of Pseudocoelmates

Answer 16

roundworms

Question 17

Coelomates

Answer 17

true body cavity lined with mesoderm

Question 18

Example of Coelomates

Answer 18

All other animals

Question 19

Cephalization

Answer 19

concentration of sense organs- developed nervous system

Question 20

Protostomes

Answer 20

Blastopore becomes the mouth. Ex-Annelids, Mollusks and arthropods

Question 21

Deuterostomes

Answer 21

Blastopore becomes anus. Ex-Chordates

Question 22

Characteristics of Animals

Answer 22

1. Multicellular, eukaryotes
2. Heterotrophs
3. Cells w/out cell walls, many have specialized functions
4. Usually have a method of movement
5. Most reproduce sexually
6. Require oxygen

Question 23

Acoelmates

Answer 23

No body cavity lined with mesoderm