Menstrual cycle Grade 12 Life Sciences Notes with Activities Questions and Answers

December 11, 2023 ajiraforum Grade 12

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Menstrual cycle Grade 12 Life Sciences Notes with Activities Questions and Answers

Menstrual cycle Grade 12 Life Sciences Notes with Activities Questions and Answers Menstrual cycle Grade 12 Life Sciences Notes under Human Reproduction are available on this website and include review activities with questions and answers to aid students in grade 12 in getting ready for examinations and exams.

Notes

Day 1–7

  • Ovaries: New follicles develop and secrete oestrogen
  • Uterus: Lining breaks down and is released (menstruation)

Day 8–13

Ovaries: Mature Graafian follicle develops:

  • The Graafian follicle moves to edge of the ovary
  • It secretes oestrogen

Uterus: Oestrogen stimulates the endometrium to become thicker and develop more blood vessels and glands

Day 14

Ovaries: Graafian follicle bursts to release an egg cell. The process is called ovulation

Day 15–22

  • Ovaries: The Graafian follicle becomes a corpus luteum that secretes progesterone
  • Uterus: Progesterone stimulates the endometrium to become even thicker and to develop more blood vessels and glands, ready to receive the embryo if an egg cell is fertilised

Day 23–28

Ovaries: If fertilisation does not take place:

• The corpus luteum shrinks and stops secreting progesterone

If fertilisation takes place:

  • The corpus luteum remains active in the ovary and continues to secrete progesterone
  • No more follicles develop in the ovaries
  • No menstruation takes place

PDF Downloadable Notes on Menstrual cycle:

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Question and Answers Activities:

Find short and long questions for Grade 12 Life Sciences, which will help you to prepare for the exams, tests, practical tasks, and assignments.

Questions

Hormonal regulation of the menstrual cycle
  1. Name the hormones A and B.
  2. Give reasons for your answers in question 1.
  3. What event occurs on day 14?
  4. Name the other two hormones involved in this cycle.
  5. Did fertilisation occur during the cycle shown in Figure 4.6?
  6. Explain your answer in question 5.

Answers

Answers to activity 3

  1. A – Oestrogen B – Progesterone
  2. A: The Graafian follicle secretes oestrogen /Oestrogen reaches
    1. its maximum level before ovulation.
    2. B: The corpus luteum produces progesterone /Progesterone reaches its maximum level after ovulation.
  1. Ovulation
  2. LH and FSH
  3. No
  4. Progesterone levels decrease, towards the end of the cycle.

How to Pass Life Sciences  Grade 12 with distinctions

One of the most significant accomplishments in your academic career is passing matric. It provides access to a wide range of post secondary options and employment possibilities. Use our best study advice to complete your matriculation, and you’ll succeed with flying colors.

  1. Attend class 
  2. Ask questions 
  3. Make notes 
  4. Study 
  5. Practise 
  6. Study groups 
  7. Extra class 
  8. Motivation 
  9. Complete assessments 
  10. Prepare for the Exams in due time

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