16.5. Sex hormones in humans
A subsection of Biology, 0610, through 16. Reproduction
Listing 10 of 104 questions
For Examiner's Use shows a section through the human female reproductive system. M N O State one function of each of the parts labelled M and N. M N State two functions of the part labelled O. For Examiner's Use When an adult female is not pregnant her menstrual cycle lasts about four weeks. Describe the changes to the uterus and ovaries during one menstrual cycle. Fertilisation may occur after sexual intercourse. Describe the process of fertilisation. Secondary sexual characteristics in females develop at puberty. State the hormone that controls this development. Describe two secondary sexual characteristics controlled by this hormone.
0610_s12_qp_21
THEORY
2012
Paper 2, Variant 1
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For Examiner's Use shows the human female reproductive system. X R S T V W Table 3.1 shows four functions of the female reproductive system. Complete the table by: • naming the part of the system that carries out each of the functions; • using the letters from to identify the part of the system named. One row has been completed for you. Table 3.1 function name of organ letter from production of gametes site of implantation site of fertilisation dilates during birth cervix V The hormone FSH is important in regulating the menstrual cycle. State the target organ of FSH. State one effect of FSH. For Examiner's Use The drug clomiphene is given to women who have difficulty in having children. The drug increases the secretion of FSH. As part of treatment for infertility, a woman was given clomiphene for five days. The concentration of oestrogen in her blood was measured every day for 27 days. The results are shown in . concentration of oestrogen in the blood / arbitrary units time / days clomiphene taken Describe the changes in oestrogen in the blood over the 27 days. You will gain credit if you use results from in your answer. For Examiner's Use Doctors thought that ovulation occurred around day 15. Explain what is meant by the term ovulation. The treatment was not successful on the first occasion. As an alternative to this treatment, women may be offered in vitro fertilisation (IVF) treatment. In IVF treatment, an egg is fertilised outside the body and the resulting embryo is placed into the uterus. Describe what happens when an egg is fertilised by a sperm. For Examiner's Use Some embryos produced by IVF do not develop because there are problems with their chromosomes, such as having the wrong number. Define the term chromosome. State the correct number of chromosomes that should be in a cell of a human embryo.
0610_s13_qp_31
THEORY
2013
Paper 3, Variant 1
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A woman wants to have a baby. Her doctor suggests that she measures her temperature every day to find out when she ovulates. On the day that she ovulates, her temperature will increase sharply. shows her temperature results over ten days. She forgot to measure her temperature on day 7. Use to work out what her temperature would have been on day 7. oC On which day did she ovulate? Her doctor told her to measure her temperature at the same time each day. Explain why this is important. Ovulation is controlled by the release of a hormone. The hormone responsible for the changes in a girl’s body when puberty takes place is the same as the hormone that controls ovulation. Name this hormone. State how hormones travel round the body.
0610_s14_qp_22
THEORY
2014
Paper 2, Variant 2
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Questions Discovered
104