PHYSIOLOGY - fertilisation

Question 1

what is the term that describes how the sperm needs to meet the eggs within 6 hours of ejaculation

Answer 1

capacitation

Question 2

what is the first step in fertilization

Answer 2

chemotaxis

Question 3

after chemotaxis, what is the next step in fertilization

Answer 3

release of acrosomal enzymes from sperm

Question 4

after release of acrosomal enzymes from sperm, what is the next step in fertilization

why is this important

Answer 4

zona reaction - binding of sperm

prevent polyspermy (other sperm binding)

Question 5

after zona reaction (binding of sperm) what is the next step in fertilisation

Answer 5

passage through extracellular envelope

Question 6

what happens after passage through extracellular envelop in fertilisation

Answer 6

fusion of pronuclei - nuclei of halploid sperm and egg = join to make diploid nucleus of zygote = fertilization complete

Question 7

how long after ovulation will ferilisation be complete

Answer 7

24 hours

Question 8

at what days does the blastocyte attach to the uterus lining (implantation)

Answer 8

5-8days

Question 9

what do the inner cells of the blastocyte go on to form

Answer 9

embryo

Question 10

what do the outer cells of the blastocyte go on to form

Answer 10

placenta