你能告诉我女性生殖系统在不育的时候是如何工作的吗?

Varies tremendously. Infertility has many causes and thus the reproductive system has many changes when infertile. You are 40 and decreasing egg number and quality are important causes of infertility. We need to make sure the woman is ovulating and releasing an egg. We also need to check for female anatomy and sperm number and function. You should seek the advice of a specialist if you have concerns.