Oogenesis

Question 1

What are the start and end products of meiosis in oogenesis?

Answer 1

Start: Primary Oocyte
Middle: Secondary Oocyte
End: 1x Ovum

Question 2

Which layer of endometrium shed during menstrual cycle?

Answer 2

Stratum functionalis

Question 3

What are the start and end products of mitosis in oogenesis?

Answer 3

Start: Oogonia
End: Primary Oocyte

Question 4

What is the acrosome reaction?

Answer 4

1) Many sperm move through granulosa cells to bind with zona pellucida
2) Acrosomal enzymes triggered from sperm’s head to digest through zona pellucida
3) Sperm advances through, and first to penetrate ZP will fuse

Question 5

What happens straight after fertilisation?

Answer 5

Syngamy

Question 6

What happens in implantation?

Answer 6

1) Blastocyst implants into endometrium on day 6
2) Trophoblast cells overlying ICM invade endometrium
3) Nutrient rich endometrial cells provide metabolic fuel for early embryo growth until placenta takes over

Question 7

What are the functions of Oestrogen and Progesterone after being stimulated by hCG?

Answer 7

O: Prepare uterus and regulate PG levels
PG: Inhibits uterine contractility to avoid foetus being delivered prematurely

Question 8

What is the role of human chorionic gonadotrophin?

Answer 8

Stimulates O and PG production, levels of hormone decrease when placenta develops and takes over