[Campbell Biology P.1074] Why do the testes in most mammals, including humans, typically resi... | Practice Question

Why do the testes in most mammals, including humans, typically reside in the scrotum?

  • A: To protect them from physical injury.
  • B: To maintain a temperature about 2°C below core body temperature, which is optimal for sperm production.
  • C: To allow for easier ejaculation of sperm.
  • D: To produce reproductive hormones at a higher rate.

Explanation

The text states: 'Most mammals produce sperm properly only when the testes are cooler than the rest of the body. In humans and many other mammals, testis temperature is maintained about 2°C below the core body temperature by the scrotum, a fold of the body wall.' This lower temperature is crucial for optimal sperm production.