Life Science- Fertilisation And Pregnancy Flashcards Preview

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Flashcards in Life Science- Fertilisation And Pregnancy Deck (17):

Both male and female

Are needed to produce sexually


When man and woman have

Intercourse, the man places his erect penis inside the woman's vagina; copulation.


Penis ejaculates

Semen into the vagina. Sperm swim up through the uterus and into the Fallopian tubes. If there is an ovum in one of the Fallopian tubes, the sperm fuses with the ovum to form a zygote


Fusion of sex cell

Fertilization. The first stage of pregnancy


If fertilization occurs

We say the woman has conceived


Few hours after fertilization

Zygote divides into many cells until a ball of cells is formed. While the zygote is dividing, it moves along the Fallopian tube to the uterus.


Ball of cells

Attaches itself to the spongy tissue layer of the endometrium on the uterus; implantation. Uterus holds the ball of cells securely. It won't call out unless something goes wrong with the uterus lining or cells


Once zygote has

Implanted itself into the endometrium of the uterus, a special disc-like structure forms to feed it; placenta.


Substances such as

Nutrients, oxygen and waste products move between the blood of the developing embryo and the mother in the placenta, but their blood never mixes.


Developing embryo is

Attached to the placenta by the umbilical cord


Zygote divides and

Grows into an embryo. After a few weeks the cells start to change to become muscles, bones, heart and blood vessels.


From week 8

Embryo is called a foetus. Foetus remains in the uterus until it is ready to be born



Period from fertilization to birth. Approximately 40 weeks in humans


Embryo is surrounded

By amniotic sac that is filled with amniotic fluid.


Amniotic sac

Protects the developing embryo in the uterus of the mother


As the foetus grows

It begins to kick and move, it sleeps and sucks its thumb. It can hear the mother's heart beating and the sounds of people talking. Some even have hiccups whilst in the uterus.


Placenta stops

Many harmful substances that could be in the mother's blood from reaching the foetus, but it can't protect the baby against nicotine, alcohol, other drugs and micro-organisms such as syphillis and rubella

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