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IGCSE-H.Reproduction
Question | Answer |
---|---|
The male gametes are called... | ...sperm |
What happens during ovulation? | The egg is released from the ovaries into the oviduct |
During ejaculation, the man experiences feelings of pleasure called... | ...an orgasm |
What is the sensitive part above the urethra called? | Clitoris |
What is the ring of muscle at the lower end of the uterus called? | Cervix |
How does a sperm move? | It lashes its tail from side to side to swim |
What does the acrosome do? | It contains enzymes that are released during fertilisation to digest a pathway through the jelly coating of the egg cell |
Where does fertilisation take place? | Oviduct |
What is implantation? | It is when the embryo embeds into the soft lining of the uterus |
What joins the fetus to the placenta? | Umbilical cord |
How long does a normal pregnancy take? | About 9 months |
Describe what happens at the beginning of labour. | The mother starts to feel small contractions of the uterus wall. |
List the 4 things that a pregnant women needs to ensure she gets adequate quantities of and explain why. | 1) Calcium - for the growth of the fetus's bones 2) Iron - to let the her body make more red blood cells to carry oxygen for the fetus 3) Carbohydrate - for energy to move her heavy body around 4) Protein - to make new tissues |
When is an embryo called a fetus? | Once all the organs have formed and the embryo has features that are recogonisably human |
What happens after fetilisation? | The zygote begins to divide until it is a hollow ball of cells. |
How does the egg move from the oviduct to the uterus? | Cilia in the oviduct move the egg to the uterus |
What is afterbirth? | It is when the placenta comes away from the uterus wall, a few minutes after birth |
What does passive immunity mean? | It is when the new born child is unable to produce antibodies of its own so it has the mother's antibodies in the blood |
What does the prostate gland do? | It secretes fluids in which the sperm can swim |
Sperm cells and the fluid from the prostate gland together make... | ...semen |
Compare sizes of a sperm cell and an egg cell | The egg cell is a 1000x bigger that the sperm cell |