Deck 5: Fetal Period

Question 1

________ Sex is first distinguishable externally

A)12 weeks
B)16 weeks
C)20 weeks
D)25 weeks
E)29 weeks

Answer 1

A
Sex is first distinguishable during the 8- to 12-week period.At 8 weeks,the external genitalia of males and females appear similar.By the tenth week,it may be possible to differentiate between males and females,but the mature form of the genitalia is not reached until the 12th week.

Question 2

________ Quickening usually occurs

A)12 weeks
B)16 weeks
C)20 weeks
D)25 weeks
E)29 weeks

Answer 2

C
During the 17- to 20-week period,movements of the fetus-quickening-usually are felt by the mother for the first time.Although the fetus begins to move several weeks earlier,the movements are usually too slight to be felt by the mother.

Question 3

________ Chorionic villi

A)A
B)B
C)C
D)D
E)E

Answer 3

A
Chorionic villi project from the wall of the chorionic sac.These important parts of the placenta normally are embedded in the endometrium and bathed in maternal blood.It is through the villi that the exchange of nutrients between mother and fetus takes place.

Question 4

________ Chorionic sac

A)A
B)B
C)C
D)D
E)E

Question 5

________ Eyebrows,head hair,and lanugo are first visible

A)12 weeks
B)16 weeks
C)20 weeks
D)25 weeks
E)29 weeks

Question 6

________ Fetus has a good chance of surviving if born prematurely

A)12 weeks
B)16 weeks
C)20 weeks
D)25 weeks
E)29 weeks

Question 7

________ Contains umbilical vessels

A)A
B)B
C)C
D)D
E)E

Question 8

________ Brown fat begins to form

A)12 weeks
B)16 weeks
C)20 weeks
D)25 weeks
E)29 weeks

Question 9

________ Ensheathed by amnion

A)A
B)B
C)C
D)D
E)E

Question 10

________ Skin is wrinkled and pink to red

A)12 weeks
B)16 weeks
C)20 weeks
D)25 weeks
E)29 weeks

Question 11

________ Vestigial structure

A)A
B)B
C)C
D)D
E)E

Question 12

________ Stage of initial activity of the fetus

A)12 weeks
B)16 weeks
C)20 weeks
D)25 weeks
E)29 weeks

Question 13

________ Skeleton first shows clearly on radiographs and sonograms

A)12 weeks
B)16 weeks
C)20 weeks
D)25 weeks
E)29 weeks

Question 14

________ Amniotic sac

A)A
B)B
C)C
D)D
E)E

Question 15

________ Head constitutes about half of the fetus

A)12 weeks
B)16 weeks
C)20 weeks
D)25 weeks
E)29 weeks