Explain the significant function of each structure in human male reproductive system.
OR
Explain the structure and important role of placenta during pregnancy period of woman.

Explanation

(i) Testis : To produce male gametes/ sperm or male hormone/ testosterone.
(ii) Urethra : Common passage for sperm and urine.
(iii) Scrotum : To provide optimal temperature to testis for the formation of sperm.
(iv) Vas deferens : To deliver the sperms to the urethra.
(v) Prostrate glands and seminal vesicles : Tu secrete the fluid which provides nutrition and medium for transport of sperms.
(vi) Penis : Delivers the sperms into vagina of female body during mating.
OR
Placenta : A special tissue that helps human embryo in obtaining nutrition from mother.s blood.
Structure : This is a disc which is embedded in the uterine wall which contains villi on the embryo side of the tissue, and on the mother.s side are blood spaces which surround the villi.
Function : This provides a large surface area for glucose and oxygen to pass from the mother to the embryo, and the developing embryo will also generate waste substances which can be removed by transferring them into the mother.s blood through the placenta.