Question

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?

Answer 1

(i) (1) Seminiferous tubules
(2) Testicular lobes
(3) Epididymis
(4) Sperm duct / Vas deferens
(ii) Functions of Part 1 (Seminiferous tubules): The cells of seminiferous tubules keep on dividing and produce sperms by the process called spermatogenesis.
Function of Part 3 (Epididymis) : (a) It helps in transportation of sperms from seminiferous tubules into vas deferens. (b) It also helps the sperm to attain maturity.
(iii) Testis are located in scrotal sac because it provides 2${}^o$ to 3${}^o$ less temperature than the body temperature, which is required for maturation of sperms.
(iv) Inguinal canals facilities the movement of testis from abdominal cavity into scrotal sac or vice-versa.
(v) Semen is an alkaline combination of sperms and seminal fluid.