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 I to 4 of the diagram.
(ii) State the functions of the parts labeled 1 and 3.
(iii)What is the significance of the testes being located in the scrotal sac outside the abdomen?
(vi)What is the role played by the inguinal canal?
(v) What is semen?