Chapter 29- Development & Inheritance

Question 1

where fertilization takes place

Answer 1

uterine tube

Question 2

flow of sperm from testes through uterus

Answer 2

testes –> epididymis —> vas deferens –> male urethra –> vagina –> uterus

Question 3

egg chromosome number

Answer 3

23

Question 4

sperm chromosome number

Answer 4

23

Question 5

zygote chromosome number

Answer 5

46

Question 6

implantation occurs on day

Answer 6

6

Question 7

sperm lifespan

Answer 7

48-72 hours

Question 8

egg lifespan

Answer 8

8-24 hours

Question 9

HCG

Answer 9

human chorionic gonadotropin
*secreted by cells surrounding the embryo to support the endometrium and embryo
*positive pregnancy test

Question 10

chorion

Answer 10

part of the placenta, fetal tissue

Question 11

amnion

Answer 11

provides a fluid environment to protect the fetus

Question 12

allantois

Answer 12

contribues to circulatory system, umbilical artery & vein

Question 13

yolk sac

Answer 13

first site of RBC formation as RBCs cannot cross the placenta

Question 14

placenta structure

Answer 14

made of fetal & maternal tissue

Question 15

placenta function

Answer 15

nutrient and gas exchange, produces progesterone and estrogen, harmful substances can cross the placenta (drugs, alcohol, HIV, measels)

Question 16

embryonic development

Answer 16

2nd-8th weeks, all major organs form

Question 17

fetal development

Answer 17

3rd-9th months, refinement of all structures

Question 18

first trimester effects on mother

Answer 18

sickness

Question 19

second trimester effects on mother

Answer 19

regain energy, uterus palpable

Question 20

third trimester

Answer 20

weight gain, complications can occur

Question 21

parts of weight gain in mother during pregnancy

Answer 21

fetus (7 lbs)
placenta & amniotic fluid (4 lbs)
blood & tissue fluid (6 lbs)
fat (3 lbs)
uterus (2 lbs)
breasts (2 lbs)