1a. An ovum is released by a mature ovarian follicle, but the subsequent corpus luteum does not secrete progesterone. If the ovum is fertilized, is implantation possible? Is a full-term pregnancy possible? Explain.

1b. The reproductive system may seem a bit isolated from other body systems in that its purpose is to create new life, not just maintain existing life. But there are significant relationships between the reproductive system and other body systems. 

Name three organ systems that the reproductive system especially depends upon, and briefly explain that dependence.