5(a)
The diagram shown below is the longitudinal section of a testis of man. Study it carefully and answer the questions that follow:
(i) Label the parts numbered 1 to 3 in the diagram.
(ii) In which part of the testis are the sperms produced?
(iii) State the functions of the parts labelled 1 and 3 in the diagram.
(iv) Name the cells that secrete Testosterone.
(v) Draw a neat, labelled diagram of a sperm.
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(i) The parts numbered 1 to 3 are:
- 1 → Scrotum / Scrotal sac
- 2 → Sperm duct / Vas deferens
- 3 → Epididymis
(ii) Seminiferous tubules is the place where the sperms are produced.
(iii) The functions of the parts labelled 1 and 3 are:
- Scrotum (Part 1) — It is a thin-walled sac of skin that protects and surrounds the testes. It also maintains the temperature of testes at 2 to 3°C less than body temperature for the maturation of sperms.
- Epididymis (Part 3) — The epididymis stores the sperms for some days for maturation and transport it to vas deferens.
(iv) Interstitial cells or Leydig cells
(v) Labelled diagram of a sperm is shown below:
