Fertilisation

Question 1

Sexual Intercourse/Fertilisation

Answer 1

• Requires erection of penis.
• Male orgasm involves contraction of vas deferens, epididymis, and associated glands after ejaculation.
• When sperm enters the uterus, this is called insemination.
• Fertilisation occurs in the uterine tube, but can also occur in the uterus.

Question 2

Secondary Oocyte during ovulation is surrounded by 2 layers

Answer 2

• Corona Radiata made of follicle cells cemented by acidic material.
• Zona Pellucida is a glycoprotein surrounding oocyte membrane.

Question 3

Ectoderm

Answer 3

• Outer layers i.e. skin, hair, nails, cornea, receptor cells of sensory organs, epithelium of openings, nervous system.

Question 4

Mesoderm

Answer 4

• Mid-layer organs, i.e. muscles, connectve tissues, lymphoid tissue, endothelium, skin, epithelium of kidneys, gonads, joint cavities.

Question 5

Endoderm

Answer 5

• Inner organs, i.e. epithelium of alimentary canal, bladder, urethra, respiratory tract.

Question 6

Amnion

Answer 6

• Encloses embryo and secretes amniotic fluid. Shock absorber, temperature controlled, free movement.

Question 7

Chorion

Answer 7

• Forms from outer layer of cells and becomes the foetal part of the placenta. Attaches to the mother via the chorionic villi. As the amnion enlarges, it fuses with inner layer of chorion.

Question 8

Yolk sac and Allantois

Answer 8

• Form outer structure of the umbilical cord.

Question 9

Placenta

Answer 9

• Supplies nutrients and antibodies, removes waste, and produces progesterone and oestrogen.
• Fully formed after 3 moths. (CL then disintegrates).