1. A – The reproductive system
The structure and function of reproductive organs and gametes and their role in fertilisation
Hormonal control of reproduction
The biology of controlling fertility
Ante- and postnatal screening

2. KA 2: Hormonal control of reproduction
(c) Menstrual Cycle
(a) Hormone release at Puberty
Hormonal Control
(b) Sperm Production

3. (b) Hormonal Control of Sperm Production
Describe the role of the following hormones in sperm production:
Follicle Stimulating Hormone (FSH)
Interstitial Cell Stimulating Hormone (ICSH)
Describe the role of testosterone in sperm production.
Describe the self regulating role of testosterone as an example of negative feedback control.

4. Hormonal Control of Sperm Production
Effect
Target Tissue
Pituitary Hormone
Endocrine Gland
Pituitary Gland
FSH
Seminiferous tubules
Promotes sperm production
ICSH
Interstitial Cells
Stimulates Testosterone production

5. FSH ICSH Seminiferous tubules Interstitial Cells Pituitary Gland
Effect
Target Tissue
Pituitary Hormone
Endocrine Gland
Pituitary Gland
FSH
Seminiferous tubules
Promotes sperm production
ICSH
Interstitial Cells
Stimulates Testosterone production
Testosterone further stimulates sperm production .
It also activates the prostate gland and seminal vesicles to produce secretions.

6. Hormonal Control of Sperm Production
What’s going on?
The pituitary gland releases ICSH which stimulates the interstitial cells to produce testosterone.
The pituitary gland also releases FSH which along with testosterone, stimulates sperm production in the seminiferous tubules

7. Negative Feedback Control
At high concentrations, testosterone inhibits the release of further FSH and ICSH by the pituitary gland.
The self-regulating mechanism is known as negative feedback control.

8. (b) Hormonal Control of Sperm Production
Describe the role of the following hormones in sperm production:
Follicle Stimulating Hormone (FSH)
Interstitial Cell Stimulating Hormone (ICSH)
Describe the role of testosterone in sperm production.
Describe the self regulating role of testosterone as an example of negative feedback control.