Q. How many of the following structures are found in the primary sex organ of a male?
(I) The network of highly coiled tubules
(II) Leydig cells
(III) Blood vessels
(IV) Seminiferous tubules

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Solution:

The testes are the primary reproductive organs of males. Each testis has about 250 compartments called testicular lobules, this compartment contains highly coiled tubules called seminiferous tubules. The regions outside the seminiferous tubules called interstitial spaces contain small blood vessels and interstitial cells or Leydig’s cells. Leydig cells constitute the endocrine tissue of the testis. Leydig cells synthesise and secrete testicular hormones called androgen.