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KS3 reproduction
| Question | Answer |
|---|---|
| When a sperm cell joins the egg cell is called .... | Fertilisation |
| Where does fertilisation happen in mammals? | Inside the females’ body (usually in the fallopian tubes) |
| Egg cells are made in the... | ovaries |
| Sperm cells are made in the …… | testicles |
| Testes are found outside the male body because ... | Sperm are heat sensitive and body temperature is too high for them |
| Explain why millions of sperm are ejaculated at once. | Even if millions are released, many will get lost, or die on the way. That way there is more chances that a few will reach the egg. |
| The egg cell passes down the oviduct (egg tube) to the ….. | lining of the uterus |
| After fertilisation the cell divides by a process called ……. | Mitosis, to produce a ball of identical cells. |
| The ball of cells is called a …… | blastocyte |
| The placenta is rich in blood vessels which have thin walls that allow .... | Oxygen and chemicals to pass from the mothers blood to the baby |
| When you can make out the head, body, arms and legs it is called a …. | embryo |
| What does the placenta prevent passing through? | Some bacteria. (but alcohol, drugs, carbon monoxide [from tobacco smoke] and some bacteria can still pass into the baby) |
| The blastocyte implants into the ….. | uterus |
| Milk is mammals is produced by the …. | mammary glands |
| The umbilical cord joins the baby to an organ called the … | placenta |
| Identical twins are produced when …. | One egg cell is fertilised by one sperm and the cell divides into two separate cells. |
| Non-identical twins are formed when ….. | Two egg cells are produced at once each fertilised by a different sperm. |
| The nucleus of sperm cells carry | Genetic information from the father |
| The nucleus of egg cells carry … | Genetic information from the mother. |
| Sperm cells had tails to help them … | swim |
| How long does the menstrual cycle last for ? | 28 days |
| When labour starts, contraction are felt, these are caused by …. | The muscle of the uterus contracting to cause the cervix to open. |
| The egg is released on which day of the menstrual cycle? | day 14 |
| The developing embryo is protected from shocks by a liquid called ….. | amniotic fluid |
| How long can sperm cells live inside the female ? | 3 days |
| The blood released in menstruation is from …. | the lining of the uterus |
| Describe how sperm cells are adapted to do their job | Tail to swim (1); many mitochondria that will provide a lot of energy (1); pointy head contains chemical to help penetrate the egg cell (1) |
| Describe two changes that happens to girls during puberty | Periods start, hairs under armpit and pubic regions; hips widen |
| Describe two changes that happens to boys during puberty | Voice break; wet dreams (production of sperm); shoulder broaden |
| Describe how the egg cell moves along the fallopian tube (aka egg tube) | Cilia (little hairs) push the egg cell along |
| Explain why fish release thousands of eggs but human only release one at a time | Human egg cell is more likely to get fertilised; fish egg cells more likely to get washed away/eaten |
| Describe what happens straight away after fertilisation. | The cell starts to divide |
| Describe the three stages of birth | Loss of amniotic fluid (waters break); contraction; loss of mucus plug from cervix (show) |
| How does the food/nutrients go from the mother to the baby? | From the mother's blood, through the placenta, to the baby's blood |
| What are the wastes produced by the baby that go back to the mother's blood? | Carbon Dioxide |
| What causes the changes in puberty? | Hormones (chemical messenger) |
| What is the name given to the process of "releasing" the egg on day 14 of the cycle? | Ovulation |
| Qu`est-ce qu`un fœtus? | Un fœtus est le stade ou le bebe ressemble a un humain ; la plupart des organes sont formes |
| Ou se trouve les ovules ? | Les ovules se trouvent dans les ovaires. |
| Que ce qui relie l`ovaire de l`utérus ? | La trompe utérine est l`organe relient l`ovaire a l`utérus. |
| Comment l’ovule fait-il pour voyager dans la trompe ? | il y a des milliers de petits poils qui font avancer l’ovule |
| Quel est le délai moyen d`un cycle des règles ? | Le délai moyen du cycle des règles est de 28 jours. |
| Pourquoi les règles font-elles mal? | Car toutes les veines qui se trouvent dans l`utérus se cassent. |
| Que sont les règles ? | Les veines passent par le col de l`utérus au vagin et sortent sous forme de sang: ce sont les règles. |
| Comment appelle t`on la poche ou se trouve le bébé ? | La poche contenant le bébé est appelée la poche amniotique ou amnios |
| A quoi sert cette poche ? | Cette poche serre à protéger le bébé d`un choque. |
| Quand apparait-il les premiers signes de puberté ? | La puberté peut apparaitre des 9 ans chez les filles et des 12 ans chez les garçons. |
| Qu’est ce qui cause la puberte ? | des messages chimiques appelles « hormones » |
Created by:
ursulinebio
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