16.5. Sex hormones in humans
A subsection of Biology, 0610, through 16. Reproduction
Listing 10 of 104 questions
The menstrual cycle is coordinated by hormones secreted by the pituitary gland and hormones secreted by the ovaries. shows some of the events that occur during the menstrual cycle. H FSH is secreted by the pituitary gland J oestrogen stimulates repair and growth of the lining of the uterus K one or more follicles start to develop in an ovary L ovulation occurs M oestrogen is secreted by follicle cells N LH is secreted by the pituitary gland O oestrogen inhibits secretion of FSH Put the stages into the correct sequence. Two have been done for you. H L Describe what happens at ovulation. Name the cell produced at fertilisation by the fusion of two gametes. If an embryo implants in the uterus, the embryo secretes a hormone known as hCG that stimulates the reproductive organs of the woman to continue to secrete progesterone. Describe what happens after fertilisation until the time that the embryo secretes hCG. State two places where progesterone is produced during pregnancy. Fertility drugs are taken to increase the chance that a woman may become pregnant. Describe and explain how these drugs improve the chances of becoming pregnant. Outline two social implications of using fertility drugs.
0610_s15_qp_31
THEORY
2015
Paper 3, Variant 1
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The menstrual cycle involves monthly changes in the ovary and the uterus. shows the sequence of changes within the ovary that occur during the menstrual cycle. R S T Name structures R and S. R S State the name of the process that is occurring at T. The ovary secretes hormones that control the growth and maintenance of the lining of the uterus. Name the hormone that stimulates: the growth of the lining of the uterus during the first half of the menstrual cycle the maintenance of the lining of the uterus during the second half of the menstrual cycle. is an electron micrograph showing a sperm cell on the surface of an egg cell. State three ways in which a sperm cell differs from an egg cell. Human body cells have 46 chromosomes. Human egg and sperm cells have 23 chromosomes each. What term is used to describe the number of chromosomes in a gamete, such as an egg cell or a sperm cell? State the organ in which fertilisation occurs in humans. Describe what happens between the event shown in and implantation in the uterus. Clomiphene citrate is a fertility drug that has been available for over 50 years. As part of a fertility treatment clomiphene citrate is taken once a day (daily dose) for about five days. Researchers investigated the use of the drug in Denmark between 1974 and 1993. The results of their study are shown in . total number of daily doses of clomiphene citrate per year year 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 Describe the change in the use of clomiphene citrate in Denmark between 1974 and 1993. Use data from in your answer. Clomiphene citrate is used as part of a treatment cycle to help women become pregnant. Often this involves artificial insemination (A. Describe how a treatment cycle involving fertility drugs and AI would be carried out.
0610_s15_qp_33
THEORY
2015
Paper 3, Variant 3
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Questions Discovered
104