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                                    Given below is a diagram of the lateral section of a testis of a man. Study the same and answer the questions that.follow : (i) Label the parts numbered 1 to 4 of the diagram. (ii) State the functions of the parts labelled 1 and 3. (iii) What is the significance of the testes being located in the scrotal sac outside the abdomen ? (iv) What is the role played by the inguinal canal ? (v) What is semen? | 
                            
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Answer»  (i) 1- Seminiferous tubules 2- Testicular lobule 3- Epididymis 4- Vas deferens (ii) 1- Seminiferous tubules: Sperm production, nourishment and protection of sperms. 3- Epididymis : Stores sperms, contributes to seminal fluid. (iii) Scrotal sac acts as thermoregulator. The temperature in scrotal sac remains 2-3o C lower than the body temperature which is suitable for maturation of sperms. (iv) Through inguinal canal, sperm duct is connected and so passes the sperms to urinary bladder. (v) Semen is a mixture of mature sperms and secretions of various accessory glands.It is a milky fluid.  | 
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