1. Your cells require many substances (molecules) to maintain homeostasis. Name as many examples of substances that are required to enter your cells. 2. What type of molecules would need to exit your cells?

3. Through what cell structure (organelle) must these molecules use to enter and exit through? Create an analogy for this cell structure

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.