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Sex organs and Hormonal Control

Sex organs and Hormonal Control. Unit 2 The Continuation of Life. Lesson Aims:. To revise the structure and function of the male reproductive system To learn about sperm production and hormonal control To revise the structure and function of the female reproductive system

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Sex organs and Hormonal Control

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  1. Sex organs and Hormonal Control Unit 2 The Continuation of Life

  2. Lesson Aims: • To revise the structure and function of the male reproductive system • To learn about sperm production and hormonal control • To revise the structure and function of the female reproductive system • To learn about egg production and hormonal control Fertilisation video clip

  3. Male Reproductive System • Made up of testicles, duct system, accessory glands and penis Functions: • produce hormones • produce sperm • store sperm • deposits sperm inside vagina during sexual intercourse

  4. Sperm production • Testosterone produced in interstitial cells stimulates sperm production • Sperm formed by meiosis in seminiferous tubules

  5. Accessory Glands • Seminal Vesicles produce prostaglandin and fructose • Prostate gland secretes enzyme-containing liquid

  6. FSH – Follicle Stimulating Hormone ICSH – Interstitial cell-stimulating hormone ICSH ICSH Hormonal Control

  7. Female Reproductive System • made up of uterus, oviducts, ovaries and vagina Functions: • produces ova • receives sperm from penis • houses and provides nutrients to the developing zygote (fertilized egg) and later the embryo and foetus • gives birth to the offspring

  8. Ovaries • Ovum contained in Graafian follicle • Follice secretes oestrogen • Follicle develops into corpus luteum after ovulation • Corpus luteum secretes progesterone

  9. Graafian follicle follicular liquid ovum Graafian Follicle

  10. Hormonal Control

  11. Continual Fertility in Males • high level of testosterone has a negative feedback effect on the secretion of FSH and ICSH by the pituitary gland • relatively constant levels of testosterone, FSH and ICSH Cyclic Fertility in Females fluctuating levels of FSH, LH, oestrogen and progesterone only fertile for a few days before and after ovulation Continual Fertility vrs Cyclical Fertility

  12. “What you should know” • p9 from “ova, the female gametes…” • to “progesterone retains the endometrium”

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