Chapter 6

Question 1

The time of the onset of labor until the cervix is dilated to 3 cm

Answer 1

initial (latent) labor phase

Question 2

eggs and sperm simultaneously shed into water

Answer 2

external fertilization

Question 3

no uterine epithelium type of mammalian placenta; Occurs in ruminant mammals (cattle, sheep, etc.)

Answer 3

syndesmochorial

Question 4

apposition without fusion (non-deciduous)

Answer 4

primitive condition

Question 5

enzymes that locally dissolve egg membranes

Answer 5

sperm lysins produced by acrosomal cap

Question 6

for internal fertilization, sperm travel within female tract by

Answer 6

passive transport

Question 7

causes cretinism

Answer 7

iodine deficiency

Question 8

causes neural tube defects

Answer 8

folate deficiency

Question 9

delivery of the placenta stage of placenta

Answer 9

third stage

Question 10

Human from week 9 of development to birth

Answer 10

fetus

Question 11

Continues from 3 cm until the cervix is dilated to 7 cm

Answer 11

active labor phase

Question 12

forms from outer somatopleure + ectoderm (outside)

Answer 12

chorion

Question 13

forms from inner somatopleure + ectoderm (inside)

Answer 13

amnion

Question 14

advanced condition type of mammalian placenta; ▪ Chorionic epithelium bathed in maternal blood
▪ Occurs in primates and many rodents

Answer 14

hemochorial

Question 15

The time of the onset of true labor until the cervix is completely dilated to 10 cm

Answer 15

first stage of childbirth

Question 16

tissues external to embryo not participating in
embryo formation, but functioning in maintenance of the embryo

Answer 16

extraembryonic membranes

Question 17

no maternal epithelium or ct type of mammalian placenta; Occurs in carnivores

Answer 17

endothelilochorial

Question 18

sperm introduced directly into female tract

Answer 18

internal fertilization

Question 19

(blood supply) marsupials mostly ___ ___

Answer 19

Choriovitelline fetal placenta

Question 20

development of the egg in the absence of sperm

Answer 20

parthenogenesis

Question 21

The period of childbirth after the cervix is dilated to 10 cm until the baby is delivered

Answer 21

second stage

Question 22

Continues from 7 cm until the cervix is fully dilated to 10 cm

Answer 22

transition phase

Question 23

main gas exchange organ for Amniote embryos

Answer 23

chorioallantoic membrane

Question 24

(German measles) can cause birth defects

Answer 24

rubella

Question 25

(blood supply) placentals

Answer 25

Chorioallantoic fetal placenta

Question 26

forms from extraembryonic hypomere (splanchnopleure) that expands to enclose yolk

Answer 26

yolk sac

Question 27

most primitive type of mammalian placenta; Occurs in pig and some other mammals
▪Maternal and fetal blood separated by 6 layers:
endothelium, CT, epithelium, epithelium, CT, endothelium

Answer 27

epitheliochorial

Question 28

Milk production by a female mammal

Answer 28

lactation

Question 29

outgrowth of splanchnopleure from posterior
region of gut in Amniotes eventually expands
to fill extraembryonic coelom composed of splanchnic mesoderm (outside) + endoderm

Answer 29

allantois

Question 30

fusion of maternal and fetal tissues (deciduous)

Answer 30

advanced condition

Question 31

Expulsion of a placental mammal from its mother’s uterus by muscle contractions

Answer 31

labor