Fertilization

Question 1

sperm viable for

Answer 1

3-5 days after ejaculation

Question 2

egg viable for

Answer 2

24 hours after ovulation

Question 3

where does fertilization usually occur?

Answer 3

ampulla of oviducts

Question 4

corona radiata

Answer 4

follicle cells surrounding the egg

Question 5

what happens to membrane once sperm has entered egg?

Answer 5

changes to prevent more sperm from entering

Question 6

what happens to zygote once formed?

Answer 6

• travels to uterus (takes 3-4 days)

- while traveling, undergoes frequent mitosis to become morula

Question 7

morula

Answer 7

what zygote rapidly divides into as travels to uterus

Question 8

what happens to morula once arrives in uterus?

Answer 8

• stays unattached for 3-4 days

- divides to become blastocyst while endometrium prepares for attachment

Question 9

blastocyst

Answer 9

• formed from morula once it reaches uterus (before attaching)
• secretes HCG

Question 10

HCG

Answer 10

• human chorionic gonadotropin
• what look for in a urine pregnancy test
• stimulates corpus luteum to release progesterone

Question 11

effect of progesterone on endometrium

Answer 11

• increased blood supply

- secretes glycogen to sustain blastocyst

Question 12

implantation occurs how long after fertilization?

Answer 12

~7 days

Question 13

what happens to blastocyst after implantation?

Answer 13

• some of its cells form 3 layers that become embryo

- rest of cells become supportive cells for embryonic function –> form supportive structures