Chapter 2

Question 1

Germinal: first 14 days

Answer 1

Rapid cell division
Beginning of cell differentiation
Implantation: begins about 10 days after conception: developing organism burrows into tissue that lines the uterus

Question 2

Embryo: third through eighth week

Answer 2

Mass of cells take shape become embryo

In fourth week minuscule blood vessel that will become heart begins to pulsate

Question 3

Fetus: ninth week until birth

Answer 3

Ninth week sex organs develop

Question 4

Age of viability

Answer 4

The age (about 22 weeks after conception) at which a fetus may survive outside the mommas uterus if medical care is available

Question 5

Finally, a baby

Answer 5

About 38 weeks after conception fetal brain signals the release of hormones to start labor

Question 6

Teratogen

Answer 6

Any agent or condition, including viruses, drugs, and chemicals, that can impair prenatal development, resulting in birth defects or complications