IGCSE Biology Paper-4: Specimen Questions with Answers 264 - 265 of 279

Passage

The diagram shows a human egg cell and a human sperm cell.

Human Egg Cell and Sperm Cell

Question 264 (3 of 6 Based on Passage)

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Three hormones that control the menstrual cycle are:

  • follicle stimulating hormone (FSH)
  • luteinizing hormone (LH)
  • oestrogen.

Name the site of production and release of oestrogen.

Explanation

The oestrogen is secreted from theca interna (granulosa cells) of graafian follicles but after ovulation the secretion continues from corpus luteum. (site- ovary) .

Question 265 (4 of 6 Based on Passage)

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Artificial insemination is sometimes used as a treatment for female infertility. Outline how artificial insemination is carried out in humans.

Explanation

The main peculiarity of the artificial insemination is that the sperm is inserted with all-natural fluids and other cells ejaculated with sperm. This form of artificial insemination includes the insertion of sperm into the woman՚s cervix. To succeed in artificial insemination, the following steps will be followed:

  • The woman will need to watch her ovulation cycle. A medical professional may administer medications to cause the woman to ovulate and increase her chances of releasing eggs.
  • The doctor will insert the sperm from the donor the woman or couple has previously chosen. The harvesting of sperm in the following ways: Masturbation, Direct removal from the man՚s reproductive system.
  • After the sperm reaches proper temperature, it is inserted into the woman՚s cervix using a specialized syringe.
  • After the insertion, the woman should remain lying for between 15 and 30 minutes to facilitate the smooth flow of the sperm into the uterus. Afterwards, she can resume her normal daily duties.
Injected and Washed Sperm

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