Observe the diagram given below and answer the questions :[Diagram: front view of the human male reproductive system — urinary bladder at the top, two seminal vesicles and the prostate gland below it, the urethra running down through the penis, and a…

Answer: (1) Human male reproductive system. (2) Seminal vesicles and prostate gland. (3) Vas deferens. (4) About 60 micrometres (0.06 mm). (5) Testosterone.

(1) The diagram shows a pair of testes in the scrotum, epididymis, vas deferens, seminal vesicles, prostate gland, urethra and penis — the organs of the human male reproductive system. (The urinary bladder is shown only for position; it belongs to the excretory system.)

(2) The seminal vesicles and the prostate gland (also Cowper’s glands) secrete fluids which nourish the sperms and help them move; together with sperms these form semen.

(3) The vas deferens carries sperms from the epididymis towards the urethra. (The urethra and the epididymis are also ducts.)

(4) A sperm is about 60 micrometres (0.06 mm) long and has a head, a middle piece and a tail.

(5) The testes secrete the male hormone testosterone, which controls sperm formation and the development of secondary sexual characters.