Final answer:
Semen specimens cannot be exposed to all temperatures. The scrotum regulates its internal temperature to optimize sperm health and motility.
Step-by-step explanation:
Semen specimens cannot be exposed to all temperatures. Sperm production in the seminiferous tubules is very sensitive to temperature, which is why the testes are located outside the body in the scrotum.
The scrotum regulates its internal temperature by contracting its muscles. When the temperature becomes too high, the scrotal muscles contract to pull the scrotum higher against the body where it is warmer.
Conversely, when the temperature becomes too low, the scrotum muscles relax to let the scrotum hang lower, where it is cooler. Maintaining the optimal temperature is crucial for sperm health and motility.