Development

Question 1

What is gestation?

Answer 1

Time the fetus grows in the uterus

Question 2

Where does fertilization take place in?

Answer 2

Ampulla of the fallopian tube

Question 3

What day does fertilization take place?

Answer 3

14-15 of 28-day cycle

Question 4

How long does fertilization last?

Answer 4

Only 15 hours after ovulation

Question 5

How old is a two-cell embryo?

Answer 5

30 hours

Question 6

How old is a 4-cell embryo?

Answer 6

45 Hours

Question 7

How old is a 8-cell embryo?

Answer 7

60 hours

Question 8

How old is a morula?

Answer 8

3 days

Question 9

How many blastomeres in a morula?

Answer 9

16

Question 10

How old is a blastocyst/blastula?

Answer 10

4 days

Question 11

When does nidation (implantation) take place?

Answer 11

Day 6

Question 12

What is a blastomere?

Answer 12

Unit-cell of the embryo

Question 13

How are blastomeres totipotent?

Answer 13

Each cell could still potentially turn into an individual (or even twins)

Question 14

When does the human embryo “hatch” out of the zona pellucida?

Answer 14

Late in blastula stage (must hatch in order to nidate)

Question 15

What will become the embryo proper?

Answer 15

Inner cell mass

Question 16

What is trophoblasts?

Answer 16

Outer wall of embryo - contributes to placenta

Question 17

What does trophoblasts do?

Answer 17

Make hCG to keep uterus ready for pregnancy (hCG makes estrogen & progesterone)

Question 18

What is blastocoel?

Answer 18

Fluid-filled space of the blastocyst

Question 19

When does nidation (implantation) Occur?

Answer 19

Day 6 after fertilization at blastula stage