Enzymes which require optimum temperature to be lower than 37°C for their proper are present in:

Explanation

Enzymes that require an optimum temperature lower than 37°C for their proper functioning are present in the testes. The testes are located outside the body in the scrotum, which allows them to be exposed to slightly lower temperatures than the internal body temperature of 37°C. Sperm production (spermatogenesis) in the testes is a temperature-sensitive process, and enzymes involved in this process work optimally at temperatures lower than the body's core temperature.The lower temperature in the scrotum is necessary for the production of viable sperm cells. Sperm production requires a cooler environment compared to the rest of the body to maintain the quality and functionality of the sperm. This is why the testes are located outside the body in the scrotum, which provides a slightly lower temperature for proper enzymatic activity and spermatogenesis.