What is the usual mode of stimulus transfer in neuron-to-neuron interactions?

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.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.