Lecture 48 Fertilisation, Implantation And Gastulation

Question 1

What happens cervical mucus at ovulation?

Answer 1

It becomes

• less thick
• increases in amount

Question 2

Fimbriae sweep what into the Fallopian tube during ovulation?

Answer 2

Ovum (egg)

Question 3

What part of the Fallopian tube does the peristaltic waves bring the ovum?

Answer 3

Ampulla of the Fallopian tube

Question 4

What is the process where the binding site of the sperm is exposed?

Answer 4

Capacitation

Question 5

What is a sperm acrosome

Answer 5

Modified lysosome located around the anterior of the sperm head

Question 6

What does the acrosome enzymes do to the zona pellucida

Answer 6

Facilitates binding and penetration of the ZP

Question 7

What does zona pellucida trigger in spermatozoon cells, driving exocytosis of acrosomal contents

Answer 7

Calcium channels

Question 8

What is the basic function of the acrosomal reaction

Answer 8

To allow the binding and penetration of the sperm cells to the egg

Question 9

What type of sperm can bind to the zona pellucidia

Answer 9

Capacitated sperm

Question 10

What is the zona pellucida

Answer 10

A glycoproteins shell, allowing acrosomal reaction and maintains sperm binding

Question 11

How does the cortical reaction prevent polyspermy

Answer 11

• removes sperm receptors on ZP surface

- hardens the ZP

Question 12

What is the name of the fully fertilised egg?

Answer 12

Zygote

Question 13

How many chromosomes does pronuclei contain

Answer 13

23 chromosomes each, fuse together when membranes breakdown= full cell

Question 14

What is the name of a cell with 23 pairs of chromosomes

Answer 14

Diploid cell

Question 15

What is the name of the series of mitosis divisions which produces cells called blastomeres?

Answer 15

Cleavage

Question 16

At what point can the blastocyst implant in the uterus?

Answer 16

When it hatches from the zona pellucida

Question 17

Which part of the blastocyst will form into the placenta

A) outer cell mass

B) inner cell mass

Answer 17

B) outer cell mass

Question 18

As week 3 begins, Gastrulation is the production of which 3 embryonic germ laters

Answer 18

Ectoderm

Mesoderm

Endoderm

Question 19

Primitive streak occurs as a result of…

Answer 19

Gastrulation and the formation of germ layers

Question 20

Which of the primary germ layers forms the CNS, PNS (epithelium of eye, ear, nose, epidermis, and appendages) mammary glands and pituitary gland?

Answer 20

Ectoderm

Question 21

Which primary germ layer gives rise to connective tissues treated smooth muscle of the hear blood and lymphatic vessels, kidneys, ovaries, and testies. Spleen, serous membranes lining the body cavities (pericardium, pleural and peritoneal)

Answer 21

Mesoderm

Question 22

Which primary germ layer gives rise to the epithelium of the GIT, respiratory tract, bladder, urethra, thyroid and parathyroid glands, liver and pancreas

Answer 22

Endoderm