2. Spermatogenesis
11.4.1 Annotate a light micrograph of testis tissue to show
the location and function of interstitial cells (Leydig cells),
germinal epithelium cells, developing spermatozoa and
Sertoli cells.
11.4.2 Outline the processes involved in spermatogenesis
within the testis, including mitosis, cell growth, the two
divisions of meiosis and cell differentiation.
(The names of the intermediate stages in spermatogenesis are
not required.)
11.4.3 State the role of LH, testosterone and FSH in
spermatogenesis.
3. Oogenesis
11.4.4 Annotate a diagram of the ovary to show the
location and function of germinal epithelium, primary
follicles, mature follicle and secondary oocyte.
11.4.5 Outline the processes involved in oogenesis within
the ovary, including mitosis, cell growth, the two
divisions of meiosis, the unequal division of cytoplasm
and the degeneration of polar body.
(The terms oogonia and primary oocyte are not required.)
4. Gametogenesis
11.4.6 Draw and label a diagram of a mature sperm and
egg.
11.4.7 Outline the role of the epididymis, seminal vesicle
and prostate gland in the production of semen.
11.4.8 Compare the processes of spermatogenesis and
oogenesis, including the number of gametes and the timing
of the formation and release of gametes.
8. Hormonal control of
Spermatogenesis
Three hormones are involved in the production of sperm.
FSH (Follicle Stimulating Hormone).
Produced in the pituitary gland (brain).
Stimulated primary spermatocytes to undergo the first meiotic
division to form secondary spermatocytes.
Testosterone.
Produced in the interstitial cells in the testies
Stimulates the development of secondary spermatocytes into
mature sperm.
LH (Lutenising Hormone) - (ICSH will not be used)
Produced in the pituitary gland (brain).
Stimulates the secretion of testosterone by the testis
9. Production of Semen
Three structures help to produce semen:
The epididymis.
Sperm arrive here unable to swim.
The sperm mature while they are stored in the epididymis and learn
to swim.
Seminal vesicles.
Produces fluid which contains nutrients for the sperm (fructose).
Also contains mucus which protects the sperm in the vagina.
Prostate gland.
Produces a fluid which contains mineral ions.
The fluid is also alkaline to protect the sperm in the acidic
conditions of the vagina.
10. Structure of Mature Sperm
Ref: Biology for the IB Diploma, Allott
Ref: Yr11 Biology, Biozone
11. Structure of the Ovaries
Ref: Biology for the IB Diploma, Allott
15. Spermatogenesis and Oogenesis
Compared
Spermatogenesis
Millions produced daily
Released during ejaculation.
Sperm formation starts during
puberty in boys.
Sperm production continues
throughout the adult life of
men.
Four sperm produced per
meiosis.
Oogenesis
One matures every 28 days
Released on about day 14 of
menstrual cycle by ovulation.
The early stages of egg
production happen during fetal
development in females.
Egg production becomes
irregular and then stops at
menopause in women.
Only one egg is produced per
meiosis.
16. IBO guide:
11.4.1 Annotate a light micrograph of testis tissue to show
the location and function of interstitial cells (Leydig cells),
germinal epithelium cells, developing spermatozoa and
Sertoli cells.
11.4.2 Outline the processes involved in spermatogenesis
within the testis, including mitosis, cell growth, the two
divisions of meiosis and cell differentiation.
(The names of the intermediate stages in spermatogenesis are
not required.)
11.4.3 State the role of LH, testosterone and FSH in
spermatogenesis.
17. IBO guide:
11.4.4 Annotate a diagram of the ovary to show the
location and function of germinal epithelium, primary
follicles, mature follicle and secondary oocyte.
11.4.5 Outline the processes involved in oogenesis within
the ovary, including mitosis, cell growth, the two
divisions of meiosis, the unequal division of cytoplasm
and the degeneration of polar body.
(The terms oogonia and primary oocyte are not required.)
18. IBO guide:
11.4.6 Draw and label a diagram of a mature sperm and
egg.
11.4.7 Outline the role of the epididymis, seminal vesicle
and prostate gland in the production of semen.
11.4.8 Compare the processes of spermatogenesis and
oogenesis, including the number of gametes and the timing
of the formation and release of gametes.