1. the skin is cut and a capillary wall breaks what's the first step in working to form a clot causes sticky fibrin filaments to form the clot a set of reactions are triggered the clot seals the area to prevent further blood loss platelets clump at the site

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.

atp is used for energy.