Fertilization-1st week

Question 1

Fertilization occurs in:

Answer 1

ampulla of fallopian tube

Question 2

Function of zona pellucida:

Answer 2

Prevents polyspermy and implantation

Question 3

Acrosomal enzymes contains:

Answer 3

acrosin, acid phosphatase, hyaluronidase

Question 4

Sequence of reactions in the 1st week of development:

Answer 4

a) Attachment
b) Binding
c) Acrosomal reaction
d) Cortical reaction
e) Zona reaction

Question 5

Time and site of events:
A) zygote forms: 
B) 2 cell stage:
C) morula:
D) advanced morula (32 cell stage):
E) blastocysts:
F)  zona pellucida disappears:
G) implantation:

Answer 5

A) within 12-24 hours after ovulation
B) 24 hours after fertilization
C) 3rd day after fertilization
D) 4th day after fertilization
E) 4 1/2 days after fertilization
F) 5th day after fertilization
G) 6th-7th day after fertilization

Question 6

Advanced morula enters uterine cavity:

Answer 6

4th day after fertilization

Question 7

Total cells of blastocyst:

Answer 7

58
53- outer cell mass-> forms trophoblast
5- inner cell mass -> forms embryoblast-> embryo proper