2. Prenatal and functional development

Question 1

Stages of prenatal growth

Answer 1

Period of the egg (germinal)
Period of the embryo
Period of the fetus

Question 2

When is the period of the egg?

Answer 2

First 2 weeks after fertilization

Question 3

What are the 4 steps of rapid cell division in sequence?

Answer 3

1) Morula
2) Blastocyst
3) Implantation
4) Differentiation of cellular layers

Question 4

When is the period of the embryo?

Answer 4

Weeks 3 to 8

Question 5

What happens during the period of the embryo?

Answer 5

Rapid growth continues
Differentiation of stem cells into specific cell types
Organization of cell types into tissues = organs

Question 6

By end of the period of the embryo, what is established?

Answer 6

All basic anatomic and physiologic features

Question 7

When is the period of the fetus?

Answer 7

Weeks 9 to 40

Question 8

When is gestation?

Answer 8

Can vary from 38 to 42 weeks

Question 9

What happens during the period of the fetus?

Answer 9

Rapid growth
Changes in proportions
Functional dev. of tissues, organs and systems

Question 10

Weight gain vs length at week 20
What type of curve?

Answer 10

10-12% of birth weight vs 50% length
Sigmoid curve (s curve)