Reproduction

Question 1

What us the acrosome reaction?

Answer 1

Triggered by sperm contacting oocyte

ZP3 protein on oocyte membrane prevents cross species fertilisation

ACROSOME releases HYALURONIDASE & ACROSIN enzymes, break through egg coating (oocyte activated).

Question 2

What happens once oocytes are activated?

Answer 2

CORTICAL GRANULES are released & cause oocyte membrane to become impermeable to other sperm.

Question 3

What is capacitation?

Answer 3

In the uterus heparin & other enzymes remove cholesterol & glycoproteins from sperm cell surface

Calcium influx results

Hyperactivity of sperm –> increased motility.

Question 4

When does the proliferative phase occur and what happens?

Answer 4

Day 5-13

Endometrium proliferates, glands & arteries form.

Progesterone receptor synthesis stimulated in ENDOMETRIAL CELLS.

Question 5

When does the late proliferative phase occur and what happens?

Answer 5

Gland are long due to growth

Stroma becomes oedematous.

Question 6

What occurs during the secretory phase?

Answer 6

Growing endometrium dependent on progesterone released from CL

tubular glands enlarge and secrete mucus and glycogen to prepare for implantation of fertilized ovum.m

Question 7

How do primary locate numbers change?

Answer 7

Before birth –> 7 mn eggs

At birth = 2 mn

Puberty = 0.4 mn

Menopause = less than 1000’

Question 8

When does a blastocyst form?

Answer 8

After 5 days when zygote reaches uterus.