6.3 Sexual Reproduction, Pregnancy, and Fetal Development Part 2

Question 1

What is the corona radiata?

Answer 1

cells that surround the follicle of the egg in the oviduct

Question 2

What happens to the egg when a sperm and egg combine?

Answer 2

egg chemically changes preventing other sperm from penetrating the egg

Question 3

How long does the zygote spend in the oviducts undergoing mitotitc divisions?

Answer 3

3-4 days

Question 4

What is the morula?

Answer 4

formed 3-4 days after the zygote

Question 5

What is the blastocyst?

Answer 5

formed 3-4 days after the morula

Question 6

What occurs while the blastocyst is formed and unattached to the uterus?

Answer 6

endometrium prepares for implantation

Question 7

What hormone helps the endometrium prepare for implantation?

Answer 7

progesterone

Question 8

What occurs in the endometrium when progestrone is released?

Answer 8

increases its blood supply
secretes glycogen

Question 9

What will implant into the endometrium?

Answer 9

blastocyst

Question 10

What does the blastocyst secrete?

Answer 10

human chorionic gonadotropin

Question 11

What is the purpose of the HCG released by the blastocyst?

Answer 11

stimulates the corpus luteum to release progesterone

Question 12

When does the blastocyst implant?

Answer 12

7th day

Question 13

Once implanted, what are the three layers of the blastocyst that form?

Answer 13

ectoderm
mesoderm
endoderm

Question 14

What do the supportive cells form of the blastocyst?

Answer 14

amnion
placenta
umbilical cord

Question 15

What is the amnion?

Answer 15

sac filled with fluid to cushion and protect the fetus

Question 16

What is the function of the placenta?

Answer 16

organ that carries out nutritive, respiratory, excretory, and endocrine functions for the embryo

Question 17

What is the purpose of the umbilical cord?

Answer 17

attaches the embryo to the placenta

Question 18

What develops from the ectoderm?

Answer 18

skin
nervous tissue

Question 19

What develops from the endoderm?

Answer 19

glands (thyroid, parathyroid, thymus)
liver
pancreas
lining of the hollow organs of the digestive tract and respiratory system

Question 20

What develops from the mesoderm?

Answer 20

cardiovascular system
red blood cells
muscle