Page Content. Clinical research aims to advance medical knowledge by studying people, either through direct interaction or through the collection and analysis of blood, tissues, or other samples. A clinical trial is one type of clinical research that follows a pre-defined plan or protocol.
The female reproductive system interacts with many other systems in the body. The most common is the endocrine system. The reproductive system relies on the endocrine system to produce hormones such as progesterone and estrogen, that help with the blood lining of the uterus and prepare the uterus for pregnancy.
The female reproductive system has two functions: The first is to produce egg cells, and the second is to protect and nourish the offspring until birth. The male reproductive system has one function, and it is to produce and deposit sperm. Humans have a high level of sexual differentiation.