Chapter 3

Question 1

when does period of zygote occur

Answer 1

1-2 weeks

Question 2

blastocyst

Answer 2

zygote after 4 days, its a hollow ball!

Question 3

germ disc

Answer 3

small cluster of cells in center of blastocyst and eventually develops into baby

Question 4

when does period of embryo occur

Answer 4

3-8 weeks

Question 5

how does embryo form

Answer 5

forms once blastocyst embeds in uterine wall

Question 6

ectoderm

Answer 6

outer layer

becomes hair, outer layer of skin, nervous system

Question 7

mesoderm

Answer 7

becomes muscle, bones, circulatory system

Question 8

endoderm

Answer 8

inner layer

becomes digestive system and lungs

Question 9

what 2 structures link embryo to mother

Answer 9

umbilical cord

villi

Question 10

what is the final and longest phase

Answer 10

period of fetus

Question 11

how long does prenatal development take

Answer 11

38 weeks

Question 12

age of viability

Answer 12

age when fetus is able to survive if born early

Question 13

when is age of viability

Answer 13

22-28 weeks

Question 14

teratogen

Answer 14

causes abnormal prenatal development

Question 15

3 types of teratogens

Answer 15

diseases
drugs
environmental hazards

Question 16

when are infants most vulnerable to sudden unexpected infant death

Answer 16

2-4 months

Question 17

apgar score

Answer 17

evaluates a newborn babys condition

Question 18

chronic villus sampling

Answer 18

sampling of tissue obtain from chorion and analyzed

Question 19

when is chronic villus sampling done

Answer 19

10-12 months