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Chapter 39
Revise the Human Reproductive System
| Question | Answer |
|---|---|
| Can you give the function of the testes? | To produce and hold the sperm and male hormones. |
| Can you give the function of the scrotum? | To keep the testes at the right temperature. |
| Can you give the function of the sperm ducts? | To carry the sperm from the testes to the penis. |
| Can you give the function of the penis? | To deliver sperm into the woman's body. |
| Give the function of the uterus? | To hold the baby during pregnancy. |
| Give the function of the fallopian tubes? | To carry the egg toward the womb and allow fertilisation. |
| Give the function of the cervix? | The entrance to the womb. |
| Give the function of the vagina? | To hold the penis during intercourse and allow childbirth. |
| Give the function of the ovaries? | To produce eggs and female hormones. |
| What is the average length of the menstrual cycle? | 28 days. |
| Describe the menstruation stage of the menstrual cycle. | Days 1-5 period occurs. Days 6-13 The lining of the womb builds up with blood. |
| Describe the ovulation stage of the menstrual cycle. | Days 13-15 an egg is released from the ovaries. |
| Describe the development of lining of womb during the menstrual cycle. | Days 15-28 The lining of the womb continues to fill with blood and then breaks down. |
| What is the fertile period of the menstrual cycle? | When the egg is released from the ovaries. |
| At what stage does the fertile period occur in the menstrual cycle? | Days 11-17. |
| What is sexual intercourse? | During sexual intercourse the man places his penis into the woman's vagina. This results in ejaculation which can lead to conception. |
| What are the male gametes in humans? | Sperm. |
| What are the female gametes in humans? | Eggs. |
| What is fertilisation? | When a sperm and a egg come together. |
| What does the fertilisation of the sperm and egg result in? | A zygote. |
| What does a zygote develop into? | An embryo. |
| Define Pregnancy. | Pregnancy lasts from conception to birth, during this time a baby is forming inside her womb. |
| How long does the average pregnancy last? | 9 months. |
| What is the placenta and what is its function? | It supplies nutrients to the baby and takes away the waste. it also stops the mothers and babies blood from mixing. |
| What is puberty? | Puberty is when a person starts to sexually develop. |
| What is contraception? | Contraception is used to stop conception during intercourse. |
| What are the two main types of contraception? | Condoms, Contraceptive pill. |
| Define genetics. | Genetics is the study of heredity. |
| What are inherited characteristics? | Characteristics that are passed on from parents. |
| What controls our inherited characteristics? | Our genes. |
| What are non-inherited characteristics? | Characteristics that we learn. |
| What is a chromosome? | A molecule of DNA. |
| Where are chromosomes found in the cell? | Inside the nucleus. |
| What is the standard number of chromosomes in a human? | 46 (23 pairs). |
| What are the two substances that chromosomes are made of? | DNA and Protein. |