development trends: basics

Question 1

five general characteristics of animals?

Answer 1

1. heterotropic: acquire food with ingestion
2. motion / locomotion with fibers.
3. multicellular: specialized cells form tissues and organs.
4. life cycle: adult is diploid: 2 complete sets of chromosomes
5. sexually reproduce: embryo develops

Question 2

acoelomate

Answer 2

no body cavity

Question 3

psuedocoelomate

Answer 3

body cavity doesn’t develop from splitting of mesoderm. body cavity is not lined with muscle tissue. developed between mesoderm and endoderm.

Question 4

coelomates / true coelom

Answer 4

body cavity lined with mesoderm cells

Question 5

three embryonic tissue layers

Answer 5

endo, meso, ecto

Question 6

in the endoderm

Answer 6

digestion and respiration structures

Question 7

in the mesoderm

Answer 7

muscles, bones, blood, skin, and reproductive organs

Question 8

The ectoderm

Answer 8

skin, brain, nervous system

Question 9

cephalization

Answer 9

sensory organs in anterior region / head

Question 10

segmentation

Answer 10

segments are specialized

Question 11

4 advantages for having a true coelom / coelomate

Answer 11

• independent movement of body wall and organs
• more space for organs/ systems
• protection of organs
• can function as hydrostatic skeleton

Question 12

3 ways a psuedocoelom contributes to structure of an organiam

Answer 12

• provides space for developpent of orgons
• substitutes for circulatory system
• provides a hydrostatic skeleton