Chapter 32 -2

Question 1

What are the 2 developmental groups animals are divided into?

Answer 1

protosomes

deuterostomes

Question 2

What do protostomes do?

Answer 2

develop mouth first from blastopore
spiral cleavage in embryo
determinate development of embryonic cells

Question 3

What do deuterostomes do?

Answer 3

develop anus first from blastopore
radical cleavage in embryo
indeterminate development of embryonic cells

Question 4

What are the 3 body cavities?

Answer 4

acoelomate
pseudocoelomate
coelomate

Question 5

What are animals with acoelomate?

Answer 5

lack complete tube & body cavity & anus

Question 6

What is a flatworm an example of?

Answer 6

acoelomate body cavity

Question 7

What do animals have with pseudocoelomate?

Answer 7

complete digestive tube w/ anus but lacks mesoderm support (tube w/in tube structure)

Question 8

What is roundworm an example of?

Answer 8

pseudocoelomate body cavity

Question 9

What do animals have with coelomate?

Answer 9

complete digestive tube w/ tissue support in body cavity & an anus

Question 10

What is earthworm an example of?

Answer 10

coelomate body cavity

Question 11

What happens in open circulatory system?

Answer 11

blood passes from vessles into sinuses, mixes w/ body fluids & reenters vessels

Question 12

What happens in closed circulatory system?

Answer 12

blood moves continuously through vessels that are separated from body fluids

Question 13

What are the body positions of invertebrates?

Answer 13

anterior - posterior
dorsal - ventral
lateral