Why the testes in human beings and mammals are situated outside the abdominal cavity within a pouch called scrotum ?

Options

A. There is not enough space in the pelvic area for the testicles to be housed internally
B. The scrotum helps in maintaining the low temperature of testes, `2.5^@C` lower than normal body temperature required for spermatogenesis
C. The scrotum helps in maintaining the high temperature of testis, `2.5^@C` higher than the normal body temperature required for spermatogenesis
D. Providing more space for the growth of epididymis

Answer

B

Explanation

Testes are extra-abdominal because for spermatogenesis, temperature required is `2.5^@C` lower than normal body temperature.