(a) The diagram shows part of a testis - Scottish Highers Human Biology - Question 6 - 2019
Question 6
(a) The diagram shows part of a testis.
\[ \text{semniferous tubule} \]
(i) Use the letter T to label a cell in the diagram that produces testosterone.
(ii) Desc... show full transcript
Worked Solution & Example Answer:(a) The diagram shows part of a testis - Scottish Highers Human Biology - Question 6 - 2019
Step 1
i) Use the letter T to label a cell in the diagram that produces testosterone.
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Answer
Label the interstitial cell located between the seminiferous tubules with the letter T.
Step 2
ii) Describe two functions of testosterone.
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Answer
Testosterone stimulates and promotes sperm production and the development of gametes.
It activates the prostate gland and seminal vesicles, triggering the production of secretions.
Step 3
iii) Describe how negative feedback control raises the concentration of testosterone in the blood if it has fallen to a low level.
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Answer
When testosterone levels drop, the hypothalamus senses this change and increases the release of Gonadotropin-Releasing Hormone (GnRH). This hormone then stimulates the pituitary gland to produce more Luteinizing Hormone (LH), which in turn prompts the interstitial cells in the testes to produce and release more testosterone, thus restoring its levels.
Step 4
AI: Describe how artificial insemination increases the chance of fertilisation.
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Answer
Artificial insemination involves collecting samples of sperm over a period of time and then inserting them directly into the female reproductive tract (vagina, uterus, or womb), which increases the likelihood of sperm meeting the egg.
Step 5
ICSI: Describe how intra-cytoplasmic sperm injection increases the chance of fertilisation.
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Answer
ICSI involves injecting a single sperm directly into an egg. This direct method increases the chances of fertilisation, especially in cases of low sperm count.
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