Embryo - 1st Week of Development

1. The morula often contains

a.     2-4 cells  

b.     8-14 cells

c.     16-32 cells

d.     62-124 cells

e.     180-360 cells

2. Which of the following structures in NOT present in the early morula stage?

a.     Inner cell mass

b.     Blastocoele

c.     Yolk sac

d.     Trophoblast

e.     Zona pellucida

3. Which of the following is the normal site of implantation?

a.      Infundibulum of the Fallopian tube

b.     Ampulla of the oviduct

c.     The cervical mucosa

d.     The uterine endometrium

e.     The germinal epithelium of the ovary

4. How long does the fertilized ovum take to implant itself in the uterine endometrium?

a.     2 days

b.     4 days

c.     7days

d.     12 days

e.     18 days

5. Which of the following components of blastocyst is capable of eroding the uterine endometrium?

a.     Cytotrophoblast

b.     Syncytiotrophoblast

c.     Inner cell mass

d.    General trophoblast

e.     Epiblast

6. Placenta previa results from implantation of the fertilized ovum in the

a.     Infundibulum of the Fallopian tube

b.     Vicinity of the uterine cervix

c.     Upper parts of the uterine body

d.     Abdominal wall

e.     Interstitial part of the Fallopian tube.

CHECK ANSWERS

1. C

2. C

3. D

4. C

5. B

6. B