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IGCSE Reproduction

Human Reproduction

QuestionAnswer
What are the male sex organs? Testicles or testes.
What are male gametes called? Spermatozoa or sperm.
What are the hormones in males called? Testosterone.
Between what ages does puberty occur in males? 10-16
Sperm cells and secreted fluids form to make what? Semen
During puberty, at what ages are hormones produced in females 10-15
During sexual intercourse, the male and females _________ each other. Stimulate
How does a penis become erect? Blood is pumped into special spongy tissue in the penis.
What does the term 'ejaculation' mean in sexual intercourse? Contractions of the urethra move the seminal fluid through the penis into the vagina.
At the time of ejaculation, the man experiences feelings of pleasure called? An orgasm.
Can a woman also experience the feelings of an orgasm? Yes, repeated movements of the erect penis against the clitoris or against the vagina wall.
Each ejaculation contains how many cubic metres? 2-5 cm cubed.
How many sperm cells are contained in each ejaculation? Up to 500 million sperm cells.
Why are so many sperm cells produced? To increase the chance of some of them reaching the oviduct, because fertilisation is such a difficult journey for the sperm cells.
Where does fertilisation take place? In the oviduct.
What is a zygote? A diploid cell resulting from the fusion of two haploid gametes; a fertilized ovum.
When a zygote divides, what is it called? Divides once to for a two-celled embryo.
What is the placenta? A flattened circular organ in the uterus of pregnant eutherian mammals, nourishing and maintaining the fetus through the umbilical cord.
What joins the fetus to the placenta? The umbilical cord.
A normal pregnancy is 9 months, in some cases babies are born prematurely. Why is this? A problem during pregnancy; early breaking of the membrane (amnion) is the most common reason.
Created by: jeremology
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